- Implement GET /api/ffmpeg/status to return current FFmpeg process status
- Support filtering by videoId and response formatting (JSON or text table)
- Include optional statistics in status response
- Implement DELETE /api/ffmpeg/status for process cleanup operations
- Allow killing processes by videoId, stale status, or all at once
- Add cache-control and CORS headers for API responses
- Add error handling with 500 response on failure
