feat(mvp): complete M13 clean-up milestone (real usernames, avatar studio redesign, pause menu, audio manager)

backend/app/routers/users.py

@@ -25,6 +25,13 @@ class UserResponse(BaseModel):
     model_config = {"from_attributes": True}
 
 
+class UserSummary(BaseModel):
+    id: int
+    username: str
+
+    model_config = {"from_attributes": True}
+
+
 class UserUpdate(BaseModel):
     email: EmailStr | None = None
     is_active: bool | None = None
@@ -40,6 +47,43 @@ async def get_current_user_profile(
     return current_user
 
 
+@router.get("/search", response_model=list[UserSummary])
+async def search_users(
+    current_user: CurrentUser,
+    db: Annotated[AsyncSession, Depends(get_db)],
+    q: str = "",
+    limit: int = 20,
+):
+    """Search active users by username substring."""
+    cleaned_q = q.strip()
+    result = await db.execute(
+        select(User)
+        .where(
+            User.is_active == True,
+            User.username.ilike(f"%{cleaned_q}%"),
+            User.id != current_user.id,
+        )
+        .limit(limit)
+    )
+    return list(result.scalars().all())
+
+
+@router.get("/by-username/{username}", response_model=UserSummary)
+async def get_user_by_username(
+    username: str,
+    current_user: CurrentUser,
+    db: Annotated[AsyncSession, Depends(get_db)],
+):
+    """Get active user by exact username."""
+    result = await db.execute(
+        select(User).where(User.username == username.strip(), User.is_active == True)
+    )
+    user = result.scalar_one_or_none()
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+    return user
+
+
 @router.get("/{user_id}", response_model=UserResponse)
 async def get_user(
     user_id: int,