prod: UI Optimisée mise en production

Fichiers mis en production:
- ✅ CSS modulaire (900+ lignes) - architecture 9 sections
- ✅ JavaScript moderne (600+ lignes) - state management complet
- ✅ Sauvegardes des fichiers originaux (.backup)
- ✅ Script de démarrage optimisé (START_WEB_OPTIMIZED.sh)
- ✅ Documentation déploiement (PRODUCTION_READY.md)

Changements CSS:
- 🏗️ Architecture modulaire avec CSS Variables
- ⚡ Animations GPU-optimisées (transform/opacity)
- ♿ prefers-reduced-motion implémenté
- 🎯 Focus visible pour accessibilité
- 📱 Responsive mobile-first
- 🎨 Design System V2 complet

Nouvelles fonctionnalités JS:
- 📦 State management centralisé (AppState)
- 🔐 Auth complète (login, register, logout)
- 🎵 Player controls: 8 boutons actifs
- 🍞 Toast notifications système
- ⌨️ Keyboard shortcuts (8 raccourcis)
- 📊 API intégrée (playlists, tracks)
- 🧭 Navigation SPA fluide
- 📱 Menu mobile responsive

Scripts:
- START_WEB_OPTIMIZED.sh - Script de démarrage optimisé

Documentation:
- PRODUCTION_READY.md - Guide complet de déploiement
- Instructions de démarrage
- Raccourcis clavier documentés
- Résolution de problèmes

Accessibilité:
- Focus states visibles
- Reduced motion support
- Touch targets 44x44px
- Contrast 4.5:1 minimum

Performance:
- Transform/opacity animations
- DOM elements cached
- Event delegation
- GPU accelerated

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>

frontend/assets/README.md

@@ -0,0 +1,48 @@
+# AudiOhm Assets
+
+## Fonts
+
+The following fonts should be downloaded and placed in `assets/fonts/`:
+
+### Outfit Fonts
+1. **Outfit-Regular.ttf**
+   - URL: https://fonts.gstatic.com/s/outfit/v1/Outfit-Regular.ttf
+   - Save as: `assets/fonts/Outfit-Regular.ttf`
+
+2. **Outfit-Medium.ttf** (500)
+   - URL: https://fonts.gstatic.com/s/outfit/v1/Outfit-Medium.ttf
+   - Save as: `assets/fonts/Outfit-Medium.ttf`
+
+3. **Outfit-SemiBold.ttf** (600)
+   - URL: https://fonts.gstatic.com/s/outfit/v1/Outfit-SemiBold.ttf
+   - Save as: https://fonts.gstatic.com/s/outfit/v1/Outfit-Bold.ttf
+   - Save as: `assets/fonts/Outfit-Bold.ttf`
+
+### Alternative: Use Google Fonts Package
+
+Instead of downloading manually, add to `pubspec.yaml`:
+
+```yaml
+dependencies:
+  google_fonts: ^6.1.0
+```
+
+Then in code:
+
+```dart
+import 'package:google_fonts/google_fonts.dart';
+
+Text(
+  'Hello',
+  style: GoogleFonts.outfit(
+    fontSize: 16,
+    fontWeight: FontWeight.w600,
+  ),
+)
+```
+
+## Images
+
+Place app icons and images in:
+- `assets/images/` - General images
+- `assets/icons/` - App icons