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/permissions.tpl

@@ -0,0 +1,64 @@
+{*
+  User permissions template
+  $Id: permissions.tpl,v 1.2 2013/03/12 19:13:18 andig2 Exp $
+*}
+
+<!-- {$smarty.template} -->
+
+<div class="row">
+	<div class="small-10 columns small-centered">
+
+		{if $message}
+		<div class="alert-box">
+			{$message}
+		</div>
+		{/if}
+
+		<h3 class="subheader">{$lang.existingusers}</h3>
+
+		<form action="permissions.php" method="post">
+
+			<h5 class="subheader">{$lang.selecteduser}</h5>
+			{html_options name=from_uid options=$owners selected=$from_uid class="autosubmit"}
+
+			<h5 class="subheader">{$lang.permtouser}</h5>
+			<table style="width:100%">
+			<thead>
+				<tr>
+					<th><h5 class="subheader">{$lang.username}</h5></th>
+					<th><h5 class="subheader">{$lang.read}</h5></th>
+					<th><h5 class="subheader">{$lang.write}</h5></th>
+				</tr>
+			</thead>
+
+			<tbody>
+				{foreach item=perm from=$permlist}
+				<tr>
+					<td class="text-centered">
+						<input type="hidden" name="newflag_{$perm.to_uid}" id="newflag_{$perm.to_uid}" value="{$perm.newentry}" />
+						{$perm.to_name}
+					</td>
+					<td class="text-centered">
+						<input type="checkbox" name="readflag_{$perm.to_uid}" id="readflag_{$perm.to_uid}" value="1" {if $perm.read}checked="checked"{/if}/>
+					</td>
+					<td class="text-centered">
+						<input type="checkbox" name="writeflag_{$perm.to_uid}" id="writeflag_{$perm.to_uid}" value="1" {if $perm.write}checked="checked"{/if}/>
+					</td>
+				</tr>
+				{/foreach}
+			</tbody>
+			</table>
+
+			<div class="row">
+				<div class="small-2 columns small-centered">
+<!--
+					<input type="button" name="back" class="button" value="{$lang.back}" onclick="window.location.href='users.php';" />
+-->
+					<input type="submit" name="save" class="button" value="{$lang.save}" />
+				</div><!-- col -->
+			</div><!-- row -->
+
+		</form>
+
+	</div><!-- col -->
+</div><!-- row -->