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/nexgen/list.tpl

@@ -0,0 +1,43 @@
+{*
+  List template
+  $Id: list.tpl,v 1.6 2013/03/21 16:27:57 andig2 Exp $
+*}
+
+<!-- {$smarty.template} -->
+
+{if !empty($deleted)}
+<div class="alert-box alert sticky">
+	{$lang.deleted}
+	<a href="#" class="close">&times;</a>
+</div>
+{/if}
+
+<div class="row">
+	<div class="small-12 columns small-centered">
+
+		{assign var=max_width value=300}
+		{assign var=max_height value=500}
+                {if !empty($list)}
+		<ul class="small-block-grid-2 large-block-grid-{$listcolumns} itemlist">
+			{foreach $list as $video name=col}
+			<li>
+				<a href="show.php?id={$video.id}" class="th radius" title="{if $video.title}{$video.title}{if $video.subtitle} - {$video.subtitle}{/if}{else}(Empty title){/if}">
+{if $config.browse_include_title eq top || $config.browse_include_title eq both}
+					<div style="margin-top:-5px;">{if $video.title}{$video.title}{if $video.subtitle} - {$video.subtitle}{/if}{else}(Empty title){/if}</div>
+{/if}
+{*
+					<!-- Uncomment this if you want to use lazy-load together with full-scale images (requires larger bandwidth - don't use for moile access) -->
+					{if $video.imgurl}<img class="lazy" src="{$video.imgurl}"/>{/if}
+*}
+					<!-- Uncomment this if you want to use lazy-load together with image thumbnails - suited for mobile access -->
+					{if $video.imgurl}<img class="lazy" src="templates/nexgen/images/nocover.png" data-original="{html_image file=$video.imgurl max_width=$max_width max_height=$max_height path_only=1}"/>{/if}
+{if $config.browse_include_title eq bottom || $config.browse_include_title eq both}
+					<div>{if $video.title}{$video.title}{if $video.subtitle} - {$video.subtitle}{/if}{else}(Empty title){/if}</div>
+{/if}
+				</a>
+			</li><!--col-->
+			{/foreach}
+		</ul><!--row-->
+                {/if}
+	</div><!--column-->
+</div><!--row-->