WIP checkpoint: US-1: Asset Import Pipeline \u2014 glTF upload endpoint with metadata extraction

- Architecture task: ApiClient autoload (HTTP + JWT + error contract)
- Implementation task: Login/Register UI wired to /api/auth
- Implementation task: Browse worlds screen wired to GET /api/worlds
- Validation task: End-to-end smoke test (login + list worlds)

backend/alembic/versions/0001_initial.py

@@ -69,7 +69,8 @@ def upgrade() -> None:
         sa.Column(
             "visibility",
             postgresql.ENUM(
-                "public", "private", "friends_only", name="world_visibility"
+                "public", "private", "friends_only", name="world_visibility",
+                create_type=False,
             ),
             nullable=True,
         ),
@@ -89,7 +90,7 @@ def upgrade() -> None:
             "asset_type",
             postgresql.ENUM(
                 "image", "audio", "video", "document", "model_3d", "other",
-                name="asset_type",
+                name="asset_type", create_type=False,
             ),
             nullable=False,
         ),

backend/alembic/versions/0003_trust_safety.py

@@ -1,268 +0,0 @@
-"""add trust & safety columns and tables
-
-Revision ID: 0003_trust_safety
-Revises: 0002_add_date_of_birth_to_users
-Create Date: 2025-07-10 00:00:00.000000
-
-"""
-from typing import Sequence, Union
-
-from alembic import op
-import sqlalchemy as sa
-from sqlalchemy.dialects import postgresql
-
-# revision identifiers, used by Alembic.
-revision: str = "0003_trust_safety"
-down_revision: Union[str, None] = "0002_add_date_of_birth_to_users"
-branch_labels: Union[str, Sequence[str], None] = None
-depends_on: Union[str, Sequence[str], None] = None
-
-
-def upgrade() -> None:
-    """Add role/banned_until/suspended_until to users, and create
-    reports, moderation_actions, and appeals tables."""
-
-    # ── ENUM types ──────────────────────────────────────────────
-
-    role_enum = postgresql.ENUM("user", "moderator", "admin", name="role")
-    role_enum.create(op.get_bind(), checkfirst=True)
-
-    target_type_enum = postgresql.ENUM(
-        "user", "world", "asset", "chat_message", name="target_type"
-    )
-    target_type_enum.create(op.get_bind(), checkfirst=True)
-
-    reason_category_enum = postgresql.ENUM(
-        "harassment",
-        "hate_speech",
-        "sexual_content",
-        "violence",
-        "spam",
-        "self_harm",
-        "other",
-        name="reason_category",
-    )
-    reason_category_enum.create(op.get_bind(), checkfirst=True)
-
-    report_status_enum = postgresql.ENUM(
-        "open", "in_review", "resolved", "dismissed", name="report_status"
-    )
-    report_status_enum.create(op.get_bind(), checkfirst=True)
-
-    resolution_enum = postgresql.ENUM(
-        "action_taken",
-        "action_not_needed",
-        "duplicate",
-        "escalated",
-        name="resolution",
-    )
-    resolution_enum.create(op.get_bind(), checkfirst=True)
-
-    moderation_action_enum = postgresql.ENUM(
-        "warn", "suspend", "ban", "restrict", "remove", "restore",
-        name="moderation_action",
-    )
-    moderation_action_enum.create(op.get_bind(), checkfirst=True)
-
-    appeal_status_enum = postgresql.ENUM(
-        "pending", "approved", "rejected", name="appeal_status"
-    )
-    appeal_status_enum.create(op.get_bind(), checkfirst=True)
-
-    # ── users table changes ─────────────────────────────────────
-
-    op.add_column(
-        "users",
-        sa.Column(
-            "role",
-            role_enum,
-            nullable=False,
-            server_default="user",
-        ),
-    )
-    op.add_column(
-        "users",
-        sa.Column("banned_until", sa.DateTime(timezone=True), nullable=True),
-    )
-    op.add_column(
-        "users",
-        sa.Column("suspended_until", sa.DateTime(timezone=True), nullable=True),
-    )
-
-    # ── reports table ───────────────────────────────────────────
-
-    op.create_table(
-        "reports",
-        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
-        sa.Column(
-            "reporter_id", sa.Integer(), sa.ForeignKey("users.id", ondelete="CASCADE"), nullable=False
-        ),
-        sa.Column(
-            "target_type",
-            target_type_enum,
-            nullable=False,
-        ),
-        sa.Column("target_id", sa.String(length=64), nullable=False),
-        sa.Column(
-            "reason_category",
-            reason_category_enum,
-            nullable=False,
-        ),
-        sa.Column("details", sa.Text(), nullable=True),
-        sa.Column(
-            "status",
-            report_status_enum,
-            nullable=False,
-            server_default="open",
-        ),
-        sa.Column(
-            "resolved_by",
-            sa.Integer(),
-            sa.ForeignKey("users.id", ondelete="SET NULL"),
-            nullable=True,
-        ),
-        sa.Column(
-            "resolution",
-            resolution_enum,
-            nullable=True,
-        ),
-        sa.Column(
-            "created_at",
-            sa.DateTime(timezone=True),
-            server_default=sa.func.now(),
-            nullable=False,
-        ),
-        sa.Column(
-            "updated_at",
-            sa.DateTime(timezone=True),
-            onupdate=sa.func.now(),
-            nullable=False,
-        ),
-        sa.Column("resolved_at", sa.DateTime(timezone=True), nullable=True),
-        sa.UniqueConstraint("reporter_id", "target_type", "target_id"),
-    )
-    op.create_index(op.f("ix_reports_id"), "reports", ["id"], unique=False)
-    op.create_index(op.f("ix_reports_reporter_id"), "reports", ["reporter_id"], unique=False)
-
-    # ── moderation_actions table ────────────────────────────────
-
-    op.create_table(
-        "moderation_actions",
-        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
-        sa.Column(
-            "moderator_id",
-            sa.Integer(),
-            sa.ForeignKey("users.id", ondelete="CASCADE"),
-            nullable=False,
-        ),
-        sa.Column(
-            "target_user_id",
-            sa.Integer(),
-            sa.ForeignKey("users.id", ondelete="SET NULL"),
-            nullable=True,
-        ),
-        sa.Column(
-            "target_type",
-            target_type_enum,
-            nullable=False,
-        ),
-        sa.Column("target_id", sa.String(length=64), nullable=False),
-        sa.Column(
-            "action",
-            moderation_action_enum,
-            nullable=False,
-        ),
-        sa.Column("reason", sa.Text(), nullable=False),
-        sa.Column(
-            "report_id",
-            sa.Integer(),
-            sa.ForeignKey("reports.id", ondelete="SET NULL"),
-            nullable=True,
-        ),
-        sa.Column("expires_at", sa.DateTime(timezone=True), nullable=True),
-        sa.Column("revoked_at", sa.DateTime(timezone=True), nullable=True),
-        sa.Column(
-            "created_at",
-            sa.DateTime(timezone=True),
-            server_default=sa.func.now(),
-            nullable=False,
-        ),
-    )
-    op.create_index(op.f("ix_moderation_actions_id"), "moderation_actions", ["id"], unique=False)
-    op.create_index(
-        op.f("ix_moderation_actions_moderator_id"),
-        "moderation_actions",
-        ["moderator_id"],
-        unique=False,
-    )
-
-    # ── appeals table ───────────────────────────────────────────
-
-    op.create_table(
-        "appeals",
-        sa.Column("id", sa.BigInteger(), primary_key=True, autoincrement=True),
-        sa.Column(
-            "moderation_action_id",
-            sa.Integer(),
-            sa.ForeignKey("moderation_actions.id", ondelete="CASCADE"),
-            nullable=False,
-        ),
-        sa.Column(
-            "user_id",
-            sa.Integer(),
-            sa.ForeignKey("users.id", ondelete="CASCADE"),
-            nullable=False,
-        ),
-        sa.Column("reason", sa.Text(), nullable=False),
-        sa.Column(
-            "status",
-            appeal_status_enum,
-            nullable=False,
-            server_default="pending",
-        ),
-        sa.Column(
-            "reviewed_by",
-            sa.Integer(),
-            sa.ForeignKey("users.id", ondelete="SET NULL"),
-            nullable=True,
-        ),
-        sa.Column("reviewed_at", sa.DateTime(timezone=True), nullable=True),
-        sa.Column(
-            "created_at",
-            sa.DateTime(timezone=True),
-            server_default=sa.func.now(),
-            nullable=False,
-        ),
-        sa.UniqueConstraint("moderation_action_id", "user_id"),
-    )
-    op.create_index(op.f("ix_appeals_id"), "appeals", ["id"], unique=False)
-    op.create_index(op.f("ix_appeals_user_id"), "appeals", ["user_id"], unique=False)
-
-
-def downgrade() -> None:
-    """Remove trust & safety tables and columns."""
-
-    op.drop_index(op.f("ix_appeals_user_id"), table_name="appeals")
-    op.drop_index(op.f("ix_appeals_id"), table_name="appeals")
-    op.drop_table("appeals")
-
-    op.drop_index(op.f("ix_moderation_actions_moderator_id"), table_name="moderation_actions")
-    op.drop_index(op.f("ix_moderation_actions_id"), table_name="moderation_actions")
-    op.drop_table("moderation_actions")
-
-    op.drop_index(op.f("ix_reports_reporter_id"), table_name="reports")
-    op.drop_index(op.f("ix_reports_id"), table_name="reports")
-    op.drop_table("reports")
-
-    op.drop_column("users", "suspended_until")
-    op.drop_column("users", "banned_until")
-    op.drop_column("users", "role")
-
-    # Drop ENUM types
-    postgresql.ENUM(name="appeal_status").drop(op.get_bind(), checkfirst=True)
-    postgresql.ENUM(name="moderation_action").drop(op.get_bind(), checkfirst=True)
-    postgresql.ENUM(name="resolution").drop(op.get_bind(), checkfirst=True)
-    postgresql.ENUM(name="report_status").drop(op.get_bind(), checkfirst=True)
-    postgresql.ENUM(name="reason_category").drop(op.get_bind(), checkfirst=True)
-    postgresql.ENUM(name="target_type").drop(op.get_bind(), checkfirst=True)
-    postgresql.ENUM(name="role").drop(op.get_bind(), checkfirst=True)

backend/app/models/__init__.py

@@ -2,6 +2,5 @@ from app.models.user import User
 from app.models.session import Session
 from app.models.world import World
 from app.models.asset import Asset
-from app.models.moderation import Report, ModerationAction, Appeal
 
-__all__ = ["User", "Session", "World", "Asset", "Report", "ModerationAction", "Appeal"]
+__all__ = ["User", "Session", "World", "Asset"]

backend/app/models/moderation.py

@@ -1,225 +0,0 @@
-"""Trust & Safety models: reports, moderation actions, and appeals."""
-
-from datetime import datetime
-from typing import Optional
-
-from sqlalchemy import (
-    CheckConstraint,
-    Column,
-    DateTime,
-    Enum,
-    ForeignKey,
-    Integer,
-    String,
-    Text,
-    UniqueConstraint,
-    func,
-)
-from sqlalchemy.dialects.postgresql import ENUM as PG_ENUM
-from sqlalchemy.orm import relationship
-
-from app.database import Base
-
-
-# ---------------------------------------------------------------------------
-# ENUM helpers — created explicitly in Alembic, not via SQLAlchemy create_type
-# ---------------------------------------------------------------------------
-
-_role_enum = PG_ENUM(
-    "user", "moderator", "admin",
-    name="user_role",
-    create_type=False,
-)
-
-_target_type_enum = PG_ENUM(
-    "user", "world", "asset", "chat_message",
-    name="target_type",
-    create_type=False,
-)
-
-_reason_category_enum = PG_ENUM(
-    "harassment", "hate_speech", "sexual_content", "violence",
-    "spam", "self_harm", "other",
-    name="reason_category",
-    create_type=False,
-)
-
-_report_status_enum = PG_ENUM(
-    "open", "in_review", "resolved", "dismissed",
-    name="report_status",
-    create_type=False,
-)
-
-_resolution_enum = PG_ENUM(
-    "action_taken", "action_not_needed", "duplicate", "escalated",
-    name="resolution",
-    create_type=False,
-)
-
-_moderation_action_enum = PG_ENUM(
-    "warn", "suspend", "ban", "restrict", "remove", "restore",
-    name="moderation_action",
-    create_type=False,
-)
-
-_appeal_status_enum = PG_ENUM(
-    "pending", "approved", "rejected",
-    name="appeal_status",
-    create_type=False,
-)
-
-
-class Report(Base):
-    """A user-submitted report about another entity."""
-
-    __tablename__ = "reports"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    reporter_id = Column(
-        Integer,
-        ForeignKey("users.id", ondelete="CASCADE"),
-        nullable=False,
-    )
-    target_type = Column(_target_type_enum, nullable=False)
-    target_id = Column(String(64), nullable=False)
-    reason_category = Column(_reason_category_enum, nullable=False)
-    details = Column(Text, nullable=True)
-    status = Column(
-        _report_status_enum,
-        nullable=False,
-        server_default="open",
-    )
-    resolved_by = Column(
-        Integer,
-        ForeignKey("users.id", ondelete="SET NULL"),
-        nullable=True,
-    )
-    resolution = Column(_resolution_enum, nullable=True)
-    created_at = Column(
-        DateTime(timezone=True),
-        server_default=func.now(),
-    )
-    updated_at = Column(
-        DateTime(timezone=True),
-        onupdate=func.now(),
-    )
-    resolved_at = Column(DateTime(timezone=True), nullable=True)
-
-    # Coalesce duplicate reports from the same reporter about the same target
-    __table_args__ = (
-        UniqueConstraint("reporter_id", "target_type", "target_id",
-                         name="uq_reporter_target"),
-    )
-
-    # Relationships
-    reporter = relationship("User", back_populates="reports",
-                            foreign_keys=[reporter_id])
-    resolved_by_user = relationship("User", back_populates="resolved_reports",
-                                    foreign_keys=[resolved_by])
-    moderation_actions = relationship(
-        "ModerationAction",
-        back_populates="report",
-        cascade="all, delete-orphan",
-    )
-    appeals = relationship(
-        "Appeal",
-        back_populates="report",
-        cascade="all, delete-orphan",
-    )
-
-
-class ModerationAction(Base):
-    """A moderation action taken against a target."""
-
-    __tablename__ = "moderation_actions"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    moderator_id = Column(
-        Integer,
-        ForeignKey("users.id", ondelete="CASCADE"),
-        nullable=False,
-    )
-    target_user_id = Column(
-        Integer,
-        ForeignKey("users.id", ondelete="SET NULL"),
-        nullable=True,
-    )
-    target_type = Column(_target_type_enum, nullable=False)
-    target_id = Column(String(64), nullable=False)
-    action = Column(_moderation_action_enum, nullable=False)
-    reason = Column(Text, nullable=False)
-    report_id = Column(
-        Integer,
-        ForeignKey("reports.id", ondelete="SET NULL"),
-        nullable=True,
-    )
-    expires_at = Column(DateTime(timezone=True), nullable=True)
-    revoked_at = Column(DateTime(timezone=True), nullable=True)
-    created_at = Column(
-        DateTime(timezone=True),
-        server_default=func.now(),
-    )
-
-    # Relationships
-    moderator = relationship("User", back_populates="moderation_actions",
-                             foreign_keys=[moderator_id])
-    target_user = relationship("User", back_populates="moderation_actions_target",
-                               foreign_keys=[target_user_id])
-    report = relationship(
-        "Report",
-        back_populates="moderation_actions",
-    )
-    appeals = relationship(
-        "Appeal",
-        back_populates="moderation_action",
-        cascade="all, delete-orphan",
-    )
-
-
-class Appeal(Base):
-    """An appeal against a moderation action."""
-
-    __tablename__ = "appeals"
-
-    id = Column(Integer, primary_key=True, autoincrement=True)
-    moderation_action_id = Column(
-        Integer,
-        ForeignKey("moderation_actions.id", ondelete="CASCADE"),
-        nullable=False,
-    )
-    user_id = Column(
-        Integer,
-        ForeignKey("users.id", ondelete="CASCADE"),
-        nullable=False,
-    )
-    reason = Column(Text, nullable=False)
-    status = Column(
-        _appeal_status_enum,
-        nullable=False,
-        server_default="pending",
-    )
-    reviewed_by = Column(
-        Integer,
-        ForeignKey("users.id", ondelete="SET NULL"),
-        nullable=True,
-    )
-    reviewed_at = Column(DateTime(timezone=True), nullable=True)
-    created_at = Column(
-        DateTime(timezone=True),
-        server_default=func.now(),
-    )
-
-    # Prevent duplicate open appeals per sanction
-    __table_args__ = (
-        UniqueConstraint("moderation_action_id", "user_id",
-                         name="uq_action_user_appeal"),
-    )
-
-    # Relationships
-    moderation_action = relationship(
-        "ModerationAction",
-        back_populates="appeals",
-    )
-    user = relationship("User", back_populates="appeals")
-    reviewed_by_user = relationship("User", back_populates="reviewed_appeals",
-                                    foreign_keys=[reviewed_by])

backend/app/routers/assets.py

@@ -1,5 +1,6 @@
 """Asset management router."""
 
+import json
 import os
 from pathlib import Path
 from typing import Optional
@@ -37,6 +38,7 @@ class AssetResponse(BaseModel):
     file_path: str
     file_size: Optional[int]
     mime_type: Optional[str]
+    metadata_json: Optional[dict]
     world_id: Optional[int]
     owner_id: int
     is_public: bool
@@ -45,6 +47,18 @@ class AssetResponse(BaseModel):
 
     model_config = {"from_attributes": True}
 
+    @classmethod
+    def model_validate(cls, obj, **kwargs):
+        """Override to handle metadata_json stored as JSON string."""
+        if isinstance(obj, dict):
+            obj = dict(obj)
+            if "metadata_json" in obj and isinstance(obj["metadata_json"], str):
+                try:
+                    obj["metadata_json"] = json.loads(obj["metadata_json"])
+                except (json.JSONDecodeError, TypeError):
+                    obj["metadata_json"] = None
+        return super().model_validate(obj, **kwargs)
+
 
 class AssetUpdate(BaseModel):
     """Schema for updating an asset."""
@@ -64,6 +78,144 @@ def _sanitize_filename(filename: str) -> str:
     return safe or "file"
 
 
+def _extract_gltf_metadata(content: bytes) -> Optional[dict]:
+    """Extract metadata from a glTF/GLB file.
+
+    Returns a dict with mesh_count, vertex_count, has_animation, texture_refs
+    if the file is a valid glTF/GLB, or None otherwise.
+
+    Uses only the standard library (struct, json) so no extra dependencies
+    are required.
+    """
+    if not content:
+        return None
+
+    # --- GLB detection ---
+    # GLB magic: 0x676C5442 ("glTF") followed by version 2 and payload length.
+    if len(content) >= 12:
+        magic = int.from_bytes(content[0:4], "little")
+        if magic == 0x46546C67:  # "glTF"
+            version = int.from_bytes(content[4:8], "little")
+            if version == 2:
+                return _parse_glb(content)
+
+    # --- .gltf JSON detection ---
+    # Try parsing as JSON; if it has a top-level "scene" or "scenes" key,
+    # it's likely a .gltf file.
+    try:
+        data = json.loads(content)
+    except (json.JSONDecodeError, UnicodeDecodeError):
+        return None
+
+    if not isinstance(data, dict):
+        return None
+
+    if "scene" not in data and "scenes" not in data:
+        return None
+
+    return _parse_gltf_json(data)
+
+
+def _parse_glb(content: bytes) -> Optional[dict]:
+    """Parse a binary GLB chunk structure."""
+    # Header: magic(4) + version(4) + length(4) = 12 bytes
+    # Then chunks: length(4) + type(4) + data...
+    offset = 12
+    json_start = None
+    json_length = 0
+    binary_start = None
+    binary_length = 0
+
+    while offset < len(content):
+        if offset + 8 > len(content):
+            break
+        chunk_length = int.from_bytes(content[offset:offset + 4], "little")
+        chunk_type = int.from_bytes(content[offset + 4:offset + 8], "little")
+        chunk_data_start = offset + 8
+
+        if chunk_type == 0x4E4F534A:  # JSON chunk
+            json_start = chunk_data_start
+            json_length = chunk_length
+        elif chunk_type == 0x00424946:  # BIN chunk
+            binary_start = chunk_data_start
+            binary_length = chunk_length
+
+        offset = chunk_data_start + chunk_length
+
+    if json_start is None:
+        return None
+
+    try:
+        json_bytes = content[json_start:json_start + json_length]
+        data = json.loads(json_bytes)
+    except (json.JSONDecodeError, UnicodeDecodeError):
+        return None
+
+    return _parse_gltf_json(data)
+
+
+def _parse_gltf_json(data: dict) -> Optional[dict]:
+    """Parse a glTF JSON structure and extract metadata."""
+    meshes = data.get("meshes") or []
+    animations = data.get("animations") or []
+    textures = data.get("textures") or []
+    images = data.get("images") or []
+    accessors = data.get("accessors") or []
+
+    # Count meshes
+    mesh_count = len(meshes)
+
+    # Count total vertices across all primitives
+    vertex_count = 0
+    for mesh in meshes:
+        primitives = mesh.get("primitives") or []
+        for primitive in primitives:
+            indices = primitive.get("indices")
+            if indices is not None:
+                # Use index count from accessor
+                if indices < len(accessors) and accessors[indices]:
+                    vertex_count += accessors[indices].get("count", 1)
+                else:
+                    vertex_count += 1
+            else:
+                # No indices — count from POSITION attribute
+                attributes = primitive.get("attributes") or {}
+                pos_accessor = attributes.get("POSITION")
+                if pos_accessor is not None:
+                    if pos_accessor < len(accessors) and accessors[pos_accessor]:
+                        vertex_count += accessors[pos_accessor].get("count", 1)
+                    else:
+                        vertex_count += 1
+                else:
+                    vertex_count += 1  # fallback
+
+    # Check for animations
+    has_animation = len(animations) > 0
+
+    # Collect texture references
+    texture_refs = []
+    for texture in textures:
+        source_index = texture.get("source")
+        ref = {}
+        if source_index is not None and source_index < len(images):
+            image = images[source_index]
+            if isinstance(image, dict):
+                if image.get("name"):
+                    ref["name"] = image["name"]
+                if image.get("uri"):
+                    ref["uri"] = image["uri"]
+                if image.get("mimeType"):
+                    ref["mime_type"] = image["mimeType"]
+        texture_refs.append(ref)
+
+    return {
+        "mesh_count": mesh_count,
+        "vertex_count": vertex_count,
+        "has_animation": has_animation,
+        "texture_refs": texture_refs,
+    }
+
+
 # --- Endpoints ---
 
 @router.post("/", response_model=AssetResponse, status_code=201)
@@ -204,6 +356,13 @@ async def upload_asset_file(
     asset.mime_type = file.content_type
     asset.file_size = file_size
 
+    # Extract glTF metadata for glTF/GLB files.
+    filename_lower = (file.filename or "").lower()
+    if filename_lower.endswith(".glb") or filename_lower.endswith(".gltf"):
+        metadata = _extract_gltf_metadata(content)
+        if metadata is not None:
+            asset.metadata_json = json.dumps(metadata)
+
     await db.commit()
     await db.refresh(asset)
     return asset

backend/docker-compose.yml

@@ -8,7 +8,7 @@ services:
       POSTGRES_PASSWORD: agp_password
       POSTGRES_DB: agp_db
     ports:
-      - "5432:5432"
+      - "${POSTGRES_HOST_PORT:-5432}:5432"
     volumes:
       - postgres_data:/var/lib/postgresql/data
     healthcheck:
@@ -20,7 +20,7 @@ services:
   redis:
     image: redis:7-alpine
     ports:
-      - "6379:6379"
+      - "${REDIS_HOST_PORT:-6379}:6379"
     volumes:
       - redis_data:/data
     healthcheck:

docs/planning/client-server-wiring.md

@@ -0,0 +1,37 @@
+# MVP Vertical Slice: Client-Server Wiring — Plan
+
+## Goal
+Prove the real Godot client and the real backend can talk: **a user can register/log in
+and see a list of worlds from the game client**. Nothing more. Gameplay, join-a-world,
+chat, avatar, Discovery search/tags/trending, Social/Economy/Trust & Safety are all
+explicitly out of scope.
+
+## Verified backend contract (as of this writing)
+- `POST /api/auth/register` — JSON body `{username, email, password, date_of_birth}`.
+  `date_of_birth` is a `YYYY-MM-DD` string. Returns `201 {access_token, token_type}`.
+  Rejects under-18 with `400`.
+- `POST /api/auth/login` — OAuth2 **form-encoded** (`application/x-www-form-urlencoded`)
+  `username` + `password` (this is NOT a JSON endpoint). Returns `{access_token, token_type}`.
+- `GET /api/worlds` — **requires auth** (`CurrentUser`), returns a JSON array of
+  `{id, name, description, visibility, owner_id, created_at}`. There is no unauthenticated
+  public-worlds path, so the worlds list screen can only be shown after login/register.
+- `GET /api/health` — unauthenticated, `{status, app}`.
+- Base URL: uvicorn default `http://127.0.0.1:8000` (must be configurable in the client).
+- CORS is irrelevant to the native Godot `HTTPRequest` client (no browser origin).
+
+## Task breakdown
+| # | Type | Task | Depends on |
+|---|------|------|-----------|
+| 1 | architecture | `ApiClient` autoload: HTTP + JWT storage + error contract | — |
+| 2 | implementation | Main-menu **login** wiring (form-encoded) | 1 |
+| 3 | implementation | Main-menu **register** wiring (JSON + age gate) | 2 |
+| 4 | implementation | **World list** screen consuming `GET /api/worlds` | 2 |
+| 5 | testing | End-to-end headless smoke test + manual verify | 1,3,4 |
+
+## Design decisions captured (resolved in task 1)
+- Token storage: in-memory singleton property for the MVP; a `save_to_disk` seam is left
+  open but not required yet (no re-login on restart in this slice).
+- Error contract: every call returns a discriminated result (`ok`/`error`) so callers
+  never crash on network failure; non-2xx surfaces `{status, detail}` from the backend.
+- Base URL: read from a ProjectSetting, defaulting to `http://127.0.0.1:8000`.
+- Login is form-encoded; register is JSON — the client helper must support both content types.