Complete M11 Creator Studio and M12 Trust & Safety for PC5

- Creator Studio: Visual behavior & property inspector, GLB model importer, binary persistence
- Trust & Safety: 18+ TOS confirmation (DOB removed), creator guidelines & briefing card on join, in-game reporting HUD
- Test Harness: Add --filter, --skip-backend, --skip-godot to run_checkpoint_tests.py

backend/app/models/world.py

@@ -31,11 +31,13 @@ class World(Base):
     )
     category = Column(String(100), nullable=True, index=True)
     tags = Column(ARRAY(String), nullable=True, server_default="{}")
+    content_guidelines = Column(Text, nullable=True)
     play_count = Column(Integer, nullable=False, server_default="0", index=True)
     last_played_at = Column(DateTime(timezone=True), nullable=True)
     created_at = Column(DateTime(timezone=True), server_default=func.now())
     updated_at = Column(DateTime(timezone=True), onupdate=func.now())
 
+
     __table_args__ = (
         Index("ix_worlds_tags", "tags", postgresql_using="gin"),
     )