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/episodes.tpl

@@ -0,0 +1,54 @@
+{*
+  Template for the video detail view/episodes chapter
+  $Id: episodes.tpl,v 2.2 2005/05/20 10:24:28 andig2 Exp $
+*}
+
+<table width="100%" class="show_plot" cellspacing="0" cellpadding="0">
+{counter start=0 print=false name=videocount}
+
+{foreach item=episode from=$video.episodes}
+
+	{if !$count}
+		{cycle values="even,odd" assign=CLASS print=false}
+		<tr class="{$CLASS}">
+	{/if}
+
+	<td class="list_episode">
+{*
+		<table width="100%" class="show_plot">
+		  <tr>
+			<td style="text-align:justify">
+*}
+				<b>
+					<a href="show.php?id={$episode.id}">{$episode.title}</a>
+					{if $episode.episode}
+						[{$episode.season}-{$episode.episode}]
+					{/if}
+				</b><br/>
+{*
+			  <b>{$lang.plot}:</b><br/>{$episode.plot}<br/>
+*}
+			  {$episode.plot}
+{*
+			</td>
+		  </tr>
+		</table>
+*}
+	</td>
+
+	{counter assign=count name=videocount}
+
+	{if $count == $listcolumns}
+		{counter start=0 print=false name=videocount}
+		</tr>
+	{/if}
+{/foreach}
+
+{if $count}
+	{section name="columnLoop" start=$count loop=$listcolumns}
+		<td class="{$CLASS}">&nbsp;</td>
+	{/section}
+	</tr>
+{/if}
+
+</table>