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/contrib.php

@@ -0,0 +1,91 @@
+<?php
+/**
+ * Contrib tools index
+ *
+ * @package videoDB
+ * @author  Chinamann <chinamann@users.sourceforge.net>
+ * @version $Id: contrib.php,v 1.3 2005/05/26 12:24:15 andig2 Exp $
+ */
+
+require_once './core/functions.php';
+
+// check for localnet
+localnet_or_die();
+
+// multiuser permission check
+permission_or_die(PERM_WRITE);
+
+/**
+ * Sort multi-dimensional arrays 
+ * (thanks to phpdotnet)
+ */
+function multidimsort($array_in, $column)
+{
+    $multiarray = array_column($array_in, $column);
+    $array_out  = array();
+
+    asort($multiarray);
+
+    // traverse new array of index values and add the corresponding element of the input array to the correct position in the output array
+    foreach ($multiarray as $key => $val)
+    {
+        $array_out[] = $array_in[$key];
+    }
+
+    // return the output array which is all nicely sorted by the index you wanted!
+    return $array_out;
+}
+
+
+// dynamic contrib loader
+$files   = array();
+$dirpath = './contrib';
+
+if ($dh = opendir($dirpath))
+{
+    while (($filename = readdir($dh)) !== false)
+    {     
+        $access = '';
+        if (!preg_match('/.*\.php$/', $filename)) continue;
+        if ($filename == 'index.php') continue;
+
+        $info    = array('contrib/'.$filename);
+        $file    = $dirpath.'/'.$filename;
+        $content = file_get_contents($file);
+
+        // title
+        if (preg_match('/<TITLE.*?>(.+?)</msi', $content, $title))
+        {
+            $info[1] = $title[1];
+        }
+        else 
+        {
+            $info[1] = preg_replace('/\.php$/', '', $filename);
+        }    
+        
+        // access
+        if (preg_match('/^.*?\*[\t ]+@meta[\t ]+ACCESS:(.*?)\n/i', $content, $access))
+        {
+            $info[2] = trim($access[1]);
+        }
+
+        // add to list of access rights are valid
+        if (empty($info[2]) || check_permission($info[2])) 
+        {
+            $files[] = $info;
+        }
+    }	
+    closedir($dh);
+}
+
+// sort by title
+$files = multidimsort($files, 1);
+
+// prepare templates
+tpl_page();
+$smarty->assign('files', $files);
+
+// display templates
+tpl_display('contrib.tpl');
+
+?>