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]>

database/migrations/2026_05_20_000001_create_video_audio_tracks_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('video_audio_tracks', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('video_id')->constrained()->cascadeOnDelete();
+            $table->string('language', 10);
+            $table->string('label', 100);
+            $table->string('path', 500);
+            $table->string('filename', 255);
+            $table->timestamps();
+
+            $table->index('video_id');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('video_audio_tracks');
+    }
+};

database/migrations/2026_05_20_000002_add_language_to_videos_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('videos', function (Blueprint $table) {
+            $table->string('language', 10)->nullable()->after('type');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('videos', function (Blueprint $table) {
+            $table->dropColumn('language');
+        });
+    }
+};

database/migrations/2026_05_21_142548_add_description_to_video_audio_tracks_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('video_audio_tracks', function (Blueprint $table) {
+            $table->text('description')->nullable()->after('label');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('video_audio_tracks', function (Blueprint $table) {
+            $table->dropColumn('description');
+        });
+    }
+};

database/migrations/2026_05_22_094614_add_title_to_video_audio_tracks_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('video_audio_tracks', function (Blueprint $table) {
+            $table->string('title')->nullable()->after('label');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('video_audio_tracks', function (Blueprint $table) {
+            $table->dropColumn('title');
+        });
+    }
+};