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/javascript/lookup.js

@@ -0,0 +1,28 @@
+/**
+ * Lookup data submission logic
+ *
+ * @package JavaScript
+ * @author  Andreas Goetz	<cpuidle@gmx.de>
+ * @version $Id: lookup.js,v 1.6 2007/12/22 13:36:43 andig2 Exp $
+ */
+
+window.focus();
+
+function returnData(id, title, subtitle, engine)
+{
+	opener.document.edi.imdbID.value = id;
+	opener.document.edi.engine.value = engine;
+//	if (!opener.document.edi.title.value)    opener.document.edi.title.value = title;
+	opener.document.edi.title.value = title;
+	if (!opener.document.edi.subtitle.value) opener.document.edi.subtitle.value = subtitle;
+	if (opener.document.edi.lookup0.checked) opener.document.edi.lookup1.checked = true;
+	opener.focus();
+	window.close();
+}
+
+function returnImage(imgurl)
+{
+	opener.document.edi.imgurl.value = imgurl;
+	opener.focus();
+	window.close();
+}