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

app/Providers/RouteServiceProvider.php

@@ -69,6 +69,12 @@ class RouteServiceProvider extends ServiceProvider
         RateLimiter::for('two-factor', fn (Request $request) => Limit::perMinute(15)->by($request->ip()));
 
         // Rate limit for radio endpoints (high traffic)
-        RateLimiter::for('radio', fn (Request $request) => Limit::perMinute(120)->by($request->user()?->id ?: $request->ip()));
+        RateLimiter::for('radio', function (Request $request) {
+            $key = $request->get('radio_api_key_id')
+                ?? $request->user()?->id
+                ?? $request->ip();
+
+            return Limit::perMinute(120)->by((string) $key);
+        });
     }
 }