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/page.tpl

@@ -0,0 +1,27 @@
+{*
+  This is the page navigation which is displayed on bottom of new filter
+  $Id: page.tpl,v 1.1 2003/10/13 16:57:00 andig2 Exp $
+*}
+	<div class="page">
+	{foreach from=$page item=curPage key=page name=pages}
+		{if $smarty.foreach.pages.first and $lastPage}
+		<a href="index.php?filter=new&OK=OK&page={$lastPage}">
+			&lt;&lt;
+		</a>
+		{/if}
+		
+		{if $curPage == 1}
+		<span class="curPage">[ {$page} ]</span>
+		{else}
+		<a href="index.php?filter=new&OK=OK&page={$page}">
+			{$page}
+		</a>
+		{/if}
+		
+		{if $smarty.foreach.pages.last and $nextPage}
+		<a href="index.php?filter={$filter}&OK=OK&page={$nextPage}">
+			&gt;&gt;
+		</a>
+		{/if}
+	{/foreach}
+	</div>