prod: UI Optimisée mise en production

- Documentation archivée et réorganisée
- Backend: Ajout tests, migrations, library service, rate limiting
- Frontend: Suppression Flutter, focus sur interface web HTML/JS
- Tailwind CSS ajouté pour le style
- Améliorations UX et corrections bugs

Generated with [Claude Code](https://claude.com/claude-code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

backend/app/models/__init__.py

@@ -1,14 +1,21 @@
 """SQLAlchemy models."""
+from app.core.database import Base
+
 from app.models.album import Album
 from app.models.artist import Artist
+from app.models.liked_track import LikedTrack
+from app.models.listening_history import ListeningHistory
 from app.models.playlist import Playlist
 from app.models.playlist_track import PlaylistTrack
 from app.models.track import Track
 from app.models.user import User
 
 __all__ = [
+    "Base",
     "Album",
     "Artist",
+    "LikedTrack",
+    "ListeningHistory",
     "Playlist",
     "PlaylistTrack",
     "Track",