Redesign UI with Vuetify and improve configuration

Major changes:
- Full UI redesign with Vuetify 3 (dark theme, modern components)
- Sidebar navigation with gradient logo
- Redesigned player controls with Material Design icons
- New room cards, track lists, and filter UI with chips
- Modern auth pages with centered cards

Configuration improvements:
- Centralized all settings in root .env file
- Removed redundant backend/.env and frontend/.env files
- Increased file upload limit to 100MB (nginx + backend)
- Added build args for Vite environment variables
- Frontend now uses relative paths (better for domain deployment)

UI Components updated:
- App.vue: v-navigation-drawer with sidebar
- MiniPlayer: v-footer with modern controls
- Queue: v-list with styled items
- RoomView: improved filters with clickable chips
- All views: Vuetify cards, buttons, text fields

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docker-compose.yml

@@ -28,7 +28,10 @@ services:
       S3_ACCESS_KEY: ${S3_ACCESS_KEY}
       S3_SECRET_KEY: ${S3_SECRET_KEY}
       S3_BUCKET_NAME: ${S3_BUCKET_NAME:-enigfm}
-      S3_REGION: ${S3_REGION:-ru-1}
+      S3_REGION: ${S3_REGION:-default}
+      MAX_FILE_SIZE_MB: ${MAX_FILE_SIZE_MB:-10}
+      MAX_STORAGE_GB: ${MAX_STORAGE_GB:-90}
+      MAX_ROOM_PARTICIPANTS: ${MAX_ROOM_PARTICIPANTS:-50}
     ports:
       - "4001:8000"
     depends_on:
@@ -40,6 +43,8 @@ services:
     build:
       context: ./frontend
       dockerfile: Dockerfile
+      args:
+        VITE_MAX_FILE_SIZE_MB: ${VITE_MAX_FILE_SIZE_MB:-100}
     ports:
       - "4000:80"
     depends_on: