feat: add videodb media index with Docker stack

- Add videodb PHP/MySQL media collection manager (Blu-ray, DVD, CD)
- Dockerfile: PHP 8.1 + Apache with GD/mysqli/exif extensions
- docker-compose.yml: app on port 6761 + MySQL 8.0 with health checks
- docker-entrypoint.sh: auto-generates config.inc.php from env vars,
  waits for MySQL, initializes DB schema idempotently
- init-db.php: CLI schema installer using app's own prefix_query() logic
- Persistent volumes for DB, cache, and cover images

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

videodb/engines/youtube.php

@@ -0,0 +1,74 @@
+<?php
+// DEFUNCT, maybe implement new api since current code doesn't work anymore: https://developers.google.com/youtube/v3/docs/search
+ 
+/**
+ * youtube.com trailer search
+ *
+ * Search trailers on youtube.com
+ *
+ * @package Engines
+ * @author  Andreas Goetz   <cpuidle@gmx.de>
+ * @author  Adam Benson	    <precarious_panther@bigpond.com>
+ * @link    http://www.youtube.com  YouTube
+ * @version $Id: youtube.php,v 1.9 2012/08/10 16:07:53 andig2 Exp $
+ */
+
+require_once './core/functions.php';
+require_once './core/httpclient.php';
+
+define('YOUTUBE_CLIENT_ID', 'ytapi-AndreasGoetz-videodb-g7dk2dh6-0');
+define('YOUTUBE_DEVELOPER_KEY', 'AI39si7znfvxGu-6OfT-PIPHxUJbAy429l63_jnWSThlJ7Hitv_gmCpJ9cE_HCnH7PDvSLgthw4wEZ5wSrw139DPLbbmLb50GQ');
+
+// http://gdata.youtube.com/feeds/api/videos?client=ytapi-AndreasGoetz-videodb-g7dk2dh6-0&key=AI39si7znfvxGu-6OfT-PIPHxUJbAy429l63_jnWSThlJ7Hitv_gmCpJ9cE_HCnH7PDvSLgthw4wEZ5wSrw139DPLbbmLb50GQ&v=2&start-index=1&max-results=10&q=alien
+
+/**
+ * Get meta information about the engine
+ */
+function youtubeMeta()
+{
+    return array('name' => 'YouTube', 'stable' => 1, 'php' => '5.0', 'capabilities' => array('trailer'));
+}
+
+function youtubeHasTrailer($title)
+{
+	return count(youtubeSearch($title)) > 0;
+}
+
+function normalize($str)
+{
+	return preg_replace('/[^a-zäöüA-ZÄÖÜ0-9\s]/', '', $str);
+}
+
+function youtubeSearch($title)
+{
+	$trailers       = array();
+    $title	        = normalize($title);
+    $trailerquery	= $title." trailer";
+
+    $youtubeurl     = "http://gdata.youtube.com/feeds/api/videos?client=".YOUTUBE_CLIENT_ID."&key=".YOUTUBE_DEVELOPER_KEY."&v=2&".
+                      "q=".urlencode($trailerquery)."&start-index=1&max-results=10";
+
+    $resp = httpClient($youtubeurl, true);    
+    if (!$resp['success']) return $trailers;
+
+    $xml    = simplexml_load_string($resp['data']);
+
+    // obtain namespaces
+    $namespaces = $xml->getNameSpaces(true);
+  
+    foreach ($xml->entry as $trailer)
+    {
+        $media      = $trailer->children($namespaces['media']); 
+        $yt         = $media->group->children($namespaces['yt']); 
+        $id         = $yt->videoid;
+
+        // API filtering code removed
+        $trailers[] = array('id' => (string) $id,
+                            'src' => (string) $trailer->content['src'],
+                            'title' => (string) $trailer->title);
+        if (count($trailers) >= 10) break;
+    }
+
+	return $trailers;
+}
+