Add multi-language audio tracks and self-hosted flag-icons

Introduce per-video language support and multiple audio tracks
(VideoAudioTrack model + migrations for language, description, title),
a reusable language-select component, and a track-editor form. Bundle
the self-hosted flag-icons v7.2.3 library and a NAS auto-sync command.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

app/Http/Controllers/UserController.php

@@ -230,9 +230,10 @@ class UserController extends Controller
 
         $videos  = $baseQuery->where('is_shorts', false)->get();
         $shorts  = (clone $allQuery)->where('is_shorts', true)->latest()->get();
+        $withFirstVideo = fn($q) => $q->orderBy('playlist_videos.position')->limit(1);
         $playlists = $isOwner
-            ? $user->playlists()->orderBy('created_at', 'desc')->get()
-            : $user->playlists()->public()->where('is_default', false)->orderBy('created_at', 'desc')->get();
+            ? $user->playlists()->with(['videos' => $withFirstVideo])->orderBy('created_at', 'desc')->get()
+            : $user->playlists()->public()->where('is_default', false)->with(['videos' => $withFirstVideo])->orderBy('created_at', 'desc')->get();
 
         $totalViews = \DB::table('video_views')
             ->whereIn('video_id', $user->videos()->pluck('id'))
@@ -400,34 +401,45 @@ class UserController extends Controller
         ]);
     }
 
+    public function notificationCount()
+    {
+        return response()->json(['unread_count' => Auth::user()->unreadNotifications()->count()]);
+    }
+
     public function fetchNotifications()
     {
         $user = Auth::user();
 
         $rawNotifications = $user->notifications()->latest()->take(50)->get();
 
-        // Bulk-fetch current video state for all notification types
+        // Bulk-fetch video state only for video-linked notifications
         $videoIds = $rawNotifications
             ->pluck('data.video_id')
             ->filter()
             ->unique()
             ->values();
 
-        $videos = \App\Models\Video::whereIn('id', $videoIds)
-            ->whereIn('visibility', ['public', 'unlisted'])
-            ->get(['id', 'thumbnail', 'visibility'])
-            ->keyBy('id');
+        $videos = $videoIds->isNotEmpty()
+            ? \App\Models\Video::whereIn('id', $videoIds)
+                ->whereIn('visibility', ['public', 'unlisted'])
+                ->get(['id', 'thumbnail', 'visibility'])
+                ->keyBy('id')
+            : collect();
 
         $notifications = $rawNotifications
             ->filter(function ($n) use ($videos) {
                 $videoId = $n->data['video_id'] ?? null;
-                return $videoId && $videos->has($videoId);
+                // Non-video notifications (subscriber, like, post, new_user) always pass
+                if (!$videoId) return true;
+                // Video notifications only if the video is still visible
+                return $videos->has($videoId);
             })
             ->take(30)
             ->map(function ($n) use ($videos) {
-                $data  = $n->data;
-                $video = $videos->get($data['video_id']);
-                $data['video_thumbnail'] = $video?->thumbnail ?? null;
+                $data = $n->data;
+                if (!empty($data['video_id'])) {
+                    $data['video_thumbnail'] = $videos->get($data['video_id'])?->thumbnail ?? null;
+                }
                 return [
                     'id'   => $n->id,
                     'read' => ! is_null($n->read_at),