feat: implement database management service layer with MySQL driver and API controllers

backend/app/Contracts/DatabaseDriverInterface.php

@@ -78,4 +78,9 @@ interface DatabaseDriverInterface
      * Perform batch update on a table.
      */
     public function batchUpdate(string $table, array $changes): bool;
+
+    /**
+     * Create a new database.
+     */
+    public function createDatabase(string $name, string $charset = 'utf8mb4', string $collation = 'utf8mb4_unicode_ci'): bool;
 }