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/default/default.css

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+body      {font-family:sans-serif;font-size:16px;}
+
+
+
+a:link    {text-decoration:none; color:#000044;}
+
+a:visited {text-decoration:none; color:#000044;}
+
+a:active  {text-decoration:none; color:#000044;}
+
+a:hover   {text-decoration:underline;}
+
+
+
+.even {background-color:#FFFFFF;}
+
+.odd  {background-color:#EEEEEE;}
+
+.lent {background-color:#FFCCCC;}
+
+
+
+.center {text-align: center;}
+
+
+
+.filter {font-size:12px}
+
+
+
+.list_title {font-weight:bold}
+
+.list_diskid {font-weight:bold;font-size:12px}
+
+.list_seen {font-size:12px}
+
+.list_info {font-style:italic}
+
+.list_plot {font-size:12px}
+
+
+
+.tableborder {border-width:1px; border-style:solid; border-color:#000000;}
+
+.infobox {border-width:1px; border-style:solid; border-color:#000000; font-size:18px;}
+
+.infobox td {text-align:center}
+
+
+
+.show_title {font-size:20pt; font-weight:bolder;}
+
+.show_subtitle {font-size:16pt; font-weight:bolder;}
+
+.show_id {font-size:16pt; font-weight:bolder;}
+
+
+
+.notavail {color:#ff0000; font-weight:bold}
+
+
+
+.logo {font-size:28px; font-weight:bolder; font-style:italic;}
+
+
+
+.splitbrain {font-size:10px;}
+
+.version {font-size:10px;}
+
+
+