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/Console/Kernel.php

@@ -24,7 +24,24 @@ class Kernel extends ConsoleKernel
             if ($nas->isEnabled()) {
                 $nas->clearNasCache(24);
             }
-        })->daily()->name('nas-cache-evict')->withoutOverlapping();
+        })->daily()->name('nas-cache-evict');
+
+        // Clean up stale temp files in public/tmp older than 1 hour
+        $schedule->call(function () {
+            $tmpDir = storage_path('app/public/tmp');
+            if (! is_dir($tmpDir)) return;
+            $cutoff = time() - 3600;
+            foreach (glob("{$tmpDir}/*") as $file) {
+                if (is_file($file) && filemtime($file) < $cutoff) @unlink($file);
+            }
+        })->hourly()->name('tmp-cleanup');
+
+        // Auto-sync local files to NAS when NAS comes back online.
+        // Runs every 10 minutes; exits immediately when NAS is unreachable.
+        $schedule->command('nas:auto-sync')
+                 ->everyTenMinutes()
+                 ->withoutOverlapping()
+                 ->runInBackground();
 
         // Weekly activity digest — every Monday at 9:00 AM (Bahrain time)
         $schedule->command('digest:weekly')