Implement Bellhop: Matrix-authenticated *arr request portal

- FastAPI backend with async SQLite session storage
- Matrix homeserver authentication (login/logout/session validation via whoami)
- Server-side proxy for Radarr, Sonarr, and Lidarr search & add APIs
- Fire-and-forget Matrix audit log bot for request tracking
- Rate-limited login endpoint (5 req/min per IP via slowapi)
- Single-page Alpine.js frontend with dark theme, media type tabs, search grid
- Dockerfile for single-container deployment
- Secure session cookies (httponly, samesite=strict, secure)

https://claude.ai/code/session_018iMt5qm4j9bk8wzytLC3E6

requirements.txt

@@ -0,0 +1,9 @@
+fastapi==0.115.6
+uvicorn[standard]==0.34.0
+httpx==0.28.1
+aiosqlite==0.20.0
+python-dotenv==1.0.1
+matrix-nio==0.24.0
+slowapi==0.1.9
+jinja2==3.1.5
+itsdangerous==2.2.0