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/vendor/paragonie/random_compat/composer.json

@@ -0,0 +1,38 @@
+{
+  "name":         "paragonie/random_compat",
+  "description":  "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
+  "keywords": [
+    "csprng",
+    "random",
+    "polyfill",
+    "pseudorandom"
+  ],
+  "license":      "MIT",
+  "type":         "library",
+  "authors": [
+    {
+      "name":     "Paragon Initiative Enterprises",
+      "email":    "security@paragonie.com",
+      "homepage": "https://paragonie.com"
+    }
+  ],
+  "support": {
+    "issues":     "https://github.com/paragonie/random_compat/issues",
+    "email":      "info@paragonie.com",
+    "source":     "https://github.com/paragonie/random_compat"
+  },
+  "require": {
+    "php": ">=5.2.0"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "*"
+  },
+  "suggest": {
+    "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
+  },
+  "autoload": {
+    "files": [
+      "lib/random.php"
+    ]
+  }
+}