- Implemented configurable public URL rewriting.

What changed:
Added pretty URL helpers/default setting in 
[includes/db.php](/Users/tyemeclifford/Documents/GH/mediaplayer/includes/db.php).
Added root rewrite rules in 
[.htaccess](/Users/tyemeclifford/Documents/GH/mediaplayer/.htaccess):/v/<slug>
/all
/search/<query>

Added Admin → Settings “Public URL Style” toggle in 
[admin/settings.php](/Users/tyemeclifford/Documents/GH/mediaplayer/admin/settings.php), 
defaulting to pretty URLs.
Updated public/player/catalogue/embed/admin preview links to use the 
configured URL style.
Added redirects from legacy ?v= and ?q= URLs to pretty routes when 
rewriting is enabled.
Documented deployment and fallback behavior in 
[README.md](/Users/tyemeclifford/Documents/GH/mediaplayer/README.md).

embed.php

@@ -200,7 +200,7 @@ header('Content-Security-Policy: frame-ancestors *');
     <!-- Title + brand overlay -->
     <div class="title-overlay" id="title-overlay">
       <span class="title-text"><?= htmlspecialchars($video['title'], ENT_QUOTES) ?></span>
-      <a class="brand-link" href="<?= $base_url ?>index.php?v=<?= urlencode($video['slug']) ?>"
+      <a class="brand-link" href="<?= h(public_absolute_url(public_video_url($video['slug']))) ?>"
          target="_blank" rel="noopener">tyclifford.com</a>
     </div>