feat(v0.10.4): Playlists collaboratives - F136, F140, F141, F143, F145
Backend:
- F141: GET /discover/playlists/editorial for editorial playlists
- F143: GET /playlists/shared/:token (public, no auth)
- F145: POST /playlists/import (JSON), GET /playlists/:id/export/m3u
- F136: GET /playlists/favoris (creates Favoris playlist if needed)
- Repo: GetFavorisByUserID, service GetOrCreateFavorisPlaylist
Frontend:
- SharedPlaylistPage at /playlists/shared/:token (public route)
- Editorial playlists section in DiscoverPage
- Export M3U in ExportPlaylistButton dropdown
- Import JSON via ImportPlaylistButton (PlaylistListPage)
- Favoris sidebar link, FavorisRedirectPage, AddToFavorisButton on tracks
Roadmap: v0.10.4 marked DONE
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