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]>

resources/views/admin/video-analytics.blade.php

@@ -5,11 +5,9 @@
 
 @php
 function flagEmoji(string $code): string {
-    $chars = '';
-    foreach (str_split(strtoupper($code)) as $c) {
-        $chars .= mb_chr(0x1F1E6 + ord($c) - ord('A'));
-    }
-    return $chars;
+    $iso = strtolower(trim($code));
+    $safe = (strlen($iso) === 2 && ctype_alpha($iso)) ? $iso : 'xx';
+    return '<span class="fi fi-' . $safe . '" style="width:20px;height:15px;border-radius:2px;display:inline-block;vertical-align:middle;"></span>';
 }
 @endphp
 
@@ -295,7 +293,7 @@ function flagEmoji(string $code): string {
         @forelse($viewsByCountry as $i => $row)
         <div class="country-row">
             <span class="country-rank">{{ $i + 1 }}</span>
-            <span class="country-flag">{{ flagEmoji($row->country) }}</span>
+            <span class="country-flag">{!! flagEmoji($row->country) !!}</span>
             <span class="country-name">{{ $row->country_name ?? $row->country }}</span>
             <div class="country-bar-wrap">
                 <div class="country-bar" style="width:{{ round(($row->total / $maxCountry) * 100) }}%"></div>
@@ -424,7 +422,7 @@ function flagEmoji(string $code): string {
                     </td>
                     <td>
                         @if($view->country)
-                            <span style="font-size:16px;">{{ flagEmoji($view->country) }}</span>
+                            {!! flagEmoji($view->country) !!}
                             <span style="font-size:13px; margin-left:4px;">{{ $view->country_name ?? $view->country }}</span>
                         @else
                             <span style="color:var(--text-secondary); font-size:12px;">Unknown</span>