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/delete.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * Delete a video
+ *
+ * Handles the deletion of a video
+ *
+ * @package videoDB
+ * @author  Andreas Gohr <a.gohr@web.de>
+ * @version $Id: delete.php,v 2.22 2013/03/10 16:20:31 andig2 Exp $
+ */
+
+require_once './core/functions.php';
+
+/**
+ * input
+ */
+$id = req_int('id');
+$redirect = req_int('redirect');
+
+/**
+ * Remove image from cache
+ *
+ * @author Andreas Goetz <cpuidle@gmx.de>
+ */
+function removeCacheFile($url)
+{
+    // get extension
+    if (preg_match("/\.(jpe?g|gif|png)$/i", $url, $matches)) 
+    {
+        // check if file exists
+        if (cache_file_exists($url, $cache_file, CACHE_IMG, $matches[1]))
+        {
+            @unlink($cache_file);
+        }
+    }
+}
+
+// check for localnet
+localnet_or_die();
+
+// @todo check if post, fail if not?
+
+// multiuser permission check
+permission_or_die(PERM_WRITE, get_owner_id($id));
+
+/*
+// remove old cover image from cache
+$SQL = 'SELECT imgurl FROM '.TBL_DATA.' WHERE id = '.$id;
+$res = runSQL($SQL);
+if (count($res))
+{
+    removeCacheFile($res[0]['imgurl']);
+}
+*/
+
+// remove actual data
+runSQL('DELETE FROM '.TBL_DATA.' WHERE id = '.$id);
+runSQL('DELETE FROM '.TBL_VIDEOGENRE.' WHERE video_id = '.$id);
+
+// clear smarty cache for this item
+#!! this does not work- at least not with Smarty3
+#$smarty->cache->clear($id);
+
+// goto index instead of delete template
+if ($redirect)
+{
+	header("Location: index.php?deleteid=$id");
+	exit;
+}
+
+// prepare templates
+tpl_page();
+
+// display templates
+$smarty->assign('delete_meta', '<meta http-equiv="refresh"; content="1; url='.session_get('listview', 'index.php').'?'.strip_tags(SID).'">');
+tpl_display('delete.tpl');
+
+