Add radio embed widget, SSE real-time, song history, moderation panel, and Auto DJ

- Embed widget: standalone iframe player with dark/light/transparent themes, copy-paste embed code admin page
- Real-time SSE: streaming now-playing/listeners/dj events, replaces polling in radio-player and embed
- Song history: auto-records song changes to radio_song_plays table, Filament resource to view
- DJ moderation: unified panel for shouts approval, song request queue, DJ applications
- Auto DJ: playlist management with round-robin playback when no DJ is live
- Refactored radio-player Alpine component to use EventSource API with auto-reconnect

routes/web.php

@@ -9,6 +9,9 @@ use App\Http\Controllers\Miscellaneous\MaintenanceController;
 use App\Http\Controllers\User\BannedController;
 use Illuminate\Support\Facades\Route;
 
+// Radio embed (public, no auth required)
+Route::get('/radio/embed', [\App\Http\Controllers\Radio\EmbedController::class, 'show'])->name('radio.embed');
+
 // Language route
 Route::get('/language/{locale}', LocaleController::class)->name('language.select');