feat: add statistic for taekwondo

Perf: resize frames to 800px, JPEG q85, add Cache-Control for uploads

Debug: add upload logging, reduce workers to 1 for HF free tier

Refactor: templates in uploads/templates/<exercise>/, served via /uploads/ endpoint

Add persistent storage, file read/download endpoints

Add admin /files and /logs endpoints for HF debugging

Disable /docs in production

Add root route for HF health check

Init