feat: modernize UI with Astro+Svelte and optimize Docker build

- Migrated frontend to Astro + Svelte 5 for cyberpunk aesthetic
- Switched to Bun for faster frontend builds
- Implemented multi-stage Docker build for smaller image size
- Refactored backend to serve static assets and proxy API requests
- Added recovery mode for manual file management

.gitignore

@@ -1,8 +1,6 @@
+fix_docker_state.sh
+data/videos.db
+.venv/
 __pycache__/
 *.pyc
 .env
-*.tar
-*.gz
-# Docker
-Dockerfile
-browser-extension/