feat: migrate to Pydantic V2 and implement rate limiting middleware
- Migrate settings.py to Pydantic V2 (SettingsConfigDict, validation_alias)
- Update config models to use @field_validator with @classmethod
- Replace deprecated datetime.utcnow() with datetime.now(timezone.utc)
- Migrate FastAPI app from @app.on_event to lifespan context manager
- Implement comprehensive rate limiting middleware with:
* Endpoint-specific rate limits (login: 5/min, register: 3/min)
* IP-based and user-based tracking
* Authenticated user multiplier (2x limits)
* Bypass paths for health, docs, static, websocket endpoints
* Rate limit headers in responses
- Add 13 comprehensive tests for rate limiting (all passing)
- Update instructions.md to mark completed tasks
- Fix asyncio.create_task usage in anime_service.py
All 714 tests passing. No deprecation warnings.
Lukas
17e5a551e1