fix: use correct envVar format and enable platform services

- Fix envVar field names (key/value/description instead of name/default)
- Ghost: use MariaDB platform service instead of SQLite
- WordPress: use MariaDB platform service
- Nextcloud: use MariaDB + Redis platform services
- Gitea: use MariaDB platform service

apps/mariadb/versions/1.0.0/config.json

@@ -2,9 +2,6 @@
   "image": "mariadb:latest",
   "port": 3306,
   "envVars": [
-    {
-      "name": "MARIADB_ROOT_PASSWORD",
-      "required": true
-    }
+    { "key": "MARIADB_ROOT_PASSWORD", "value": "", "description": "Root password", "required": true }
   ]
 }