feat: implement dynamic database connection service with MySQL driver and API schema endpoints

backend/app/Contracts/DatabaseDriverInterface.php

@@ -14,6 +14,16 @@ interface DatabaseDriverInterface
      */
     public function query(string $sql, array $bindings = []): array;
 
+    /**
+     * Get the table schema.
+     */
+    public function getTableSchema(string $table): array;
+
+    /**
+     * Get table data.
+     */
+    public function getTableData(string $table, int $limit = 100, int $offset = 0): array;
+
     /**
      * Get the underlying connection instance.
      */