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]>

routes/web.php

@@ -39,6 +39,7 @@ Route::get('/videos/{numericId}', function ($numericId) {
 Route::get('/videos/share/{token}', [VideoController::class, 'showByToken'])->name('videos.showByToken');
 Route::get('/videos/{video}', [VideoController::class, 'show'])->name('videos.show');
 Route::get('/videos/{video}/stream', [VideoController::class, 'stream'])->name('videos.stream');
+Route::get('/videos/{video}/audio-track/{track}', [VideoController::class, 'streamAudioTrack'])->name('videos.audio-track');
 Route::get('/videos/{video}/hls/{file?}', [VideoController::class, 'hls'])->where(['file' => '.*'])->name('videos.hls');
 Route::get('/videos/{video}/download', [VideoController::class, 'download'])->name('videos.download');
 Route::get('/videos/{video}/download-mp3', [VideoController::class, 'downloadMp3'])->name('videos.downloadMp3');
@@ -62,6 +63,7 @@ Route::middleware(['auth', 'verified'])->group(function () {
     Route::put('/videos/{video}', [VideoController::class, 'update'])->name('videos.update');
     Route::post('/videos/{video}/replace-file', [VideoController::class, 'replaceFile'])->name('videos.replaceFile');
     Route::delete('/videos/{video}', [VideoController::class, 'destroy'])->name('videos.destroy');
+    Route::delete('/videos/{video}/audio-track/{track}', [VideoController::class, 'deleteAudioTrack'])->name('videos.audio-track.delete');
 
     // Like/unlike routes
     Route::post('/videos/{video}/like', [UserController::class, 'like'])->name('videos.like');
@@ -72,6 +74,7 @@ Route::middleware(['auth', 'verified'])->group(function () {
 // Subscribe + notifications — auth but NOT email verification required
 Route::middleware(['auth'])->group(function () {
     Route::post('/channel/{user}/subscribe', [UserController::class, 'toggleSubscribe'])->name('channel.subscribe');
+    Route::get('/notifications/count', [UserController::class, 'notificationCount'])->name('notifications.count');
     Route::get('/notifications/fetch', [UserController::class, 'fetchNotifications'])->name('notifications.fetch');
     Route::post('/notifications/{id}/read', [UserController::class, 'markNotificationRead'])->name('notifications.read');
     Route::post('/notifications/read-all', [UserController::class, 'markAllNotificationsRead'])->name('notifications.read-all');