Lukas 3551838887 Add startup health checks and /health/ready endpoint ...

- Add _run_startup_health_checks() function in fastapi_app.py
  - Check ffmpeg availability (warning)
  - Check DNS resolution for aniworld.to and api.themoviedb.org (warning)
  - Check anime_directory configuration and writability (error)
- Store startup checks in app.state for health endpoint access
- Add /health/ready endpoint for container orchestrators
  - Returns not_ready with 503 when critical failures present
  - Includes critical_failures list for debugging
- Update /health endpoint to include startup check results
  - Status reflects worst check (error > warning > ok)
- Document health check endpoints in DEVELOPMENT.md
- Add unit tests for startup health checks
- Add unit tests for /health/ready endpoint

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

2026-05-23 22:12:03 +02:00

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