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/templates/modern/lookup_engines.tpl

@@ -0,0 +1,17 @@
+{*
+  Lookup engine options
+  $Id: lookup_engines.tpl,v 1.1 2008/02/03 17:59:24 andig2 Exp $
+*}
+
+<input type="hidden" name="engine" id="engine" value="{$engine}" />
+{if $searchtype}<input type="hidden" name="searchtype" id="searchtype" value="{$searchtype}" />{/if}
+
+{if $engine=="amazona2s" || $engine=="amazonxml"}
+    {html_options name=catalog values=$catalog output=$catalog selected=$selectedcatalog}
+{/if}
+{if $engine=="amazonxml"}
+    {html_options name=area values=$area output=$area selected=$selectedarea}
+{/if}
+{if $engine=="imdb"}
+    {html_checkbox name="searchaka" value="1" checked=$searchaka label=$lang.aka}
+{/if}