🎉 Initial commit: AudiOhm - Alternative à Spotify avec streaming YouTube

Features:
- Frontend Flutter avec thème néon cyberpunk
- Backend FastAPI avec streaming YouTube
- Base de données PostgreSQL + Redis
- Authentification JWT complète
- Recherche multi-source (DB + YouTube)
- Playlists CRUD avec drag & drop
- Queue management
- Settings avec audio quality
- Interface adaptative (Desktop + Mobile)

Tech Stack:
- Frontend: Flutter 3.2+, Riverpod
- Backend: Python 3.11+, FastAPI
- Database: PostgreSQL 15+
- Cache: Redis 7+
- Streaming: yt-dlp + FFmpeg

🚀 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>

frontend/lib/core/constants/api_constants.dart

@@ -0,0 +1,48 @@
+/// API constants
+class ApiConstants {
+  ApiConstants._();
+
+  // Base URLs
+  static const String baseUrl = String.fromEnvironment(
+    'API_BASE_URL',
+    defaultValue: 'http://localhost:8000/api/v1',
+  );
+
+  static const String wsUrl = String.fromEnvironment(
+    'WS_BASE_URL',
+    defaultValue: 'ws://localhost:8000',
+  );
+
+  // Timeout durations
+  static const int connectionTimeoutMs = 30000; // 30 seconds
+  static const int receiveTimeoutMs = 30000;
+  static const int sendTimeoutMs = 30000;
+
+  // API Endpoints
+  static const String auth = '/auth';
+  static const String music = '/music';
+  static const String playlists = '/playlists';
+  static const String library = '/library';
+  static const String search = '/search';
+
+  // Auth endpoints
+  static const String login = '/auth/login';
+  static const String register = '/auth/register';
+  static const String refresh = '/auth/refresh';
+  static const String logout = '/auth/logout';
+  static const String me = '/auth/me';
+
+  // Music endpoints
+  static const String tracks = '/music/tracks';
+  static const String artists = '/music/artists';
+  static const String albums = '/music/albums';
+  static const String searchMusic = '/music/search';
+  static const String stream = '/stream';
+  static const String recommendations = '/music/tracks';
+  static const String trending = '/music/trending';
+
+  // Playlist endpoints
+  static const String userPlaylists = '/playlists';
+  static const String playlistTracks = '/tracks';
+  static const String reorder = '/tracks/reorder';
+}