fix: pre-connect to Nostr relay at startup

fix: close stale WebSocket after relay timeout

feat: migrate from YGG HTTP scraping to ygg.gratis Nostr relay

feat: centralize config + add CF sidecar health check

docs: add one-liner quick start to README

docs: add README with setup, config, and architecture

fix: invalidate YGG session after proactive CF refresh

docs: add CF_REFRESH_INTERVAL to .env.example

feat: wire CF proactive refresh start/stop into FastAPI lifespan

feat: add asyncio.Event blocking and proactive background refresh to CfClearanceAdapter

feat: add cf_refresh_interval config setting

fix: only retry 403 when Cloudflare challenge detected

fix: accept limit=0 from Prowlarr (use default 50)

fix: auto-refresh CF cookies and re-login on 403

fix: revert port bind to 0.0.0.0 for Docker inter-container access