feat: implement backend database management API and frontend service integration

backend/app/Http/Controllers/Api/SchemaController.php

@@ -176,4 +176,15 @@ class SchemaController extends Controller
             return Response::json(['error' => $e->getMessage()], 400);
         }
     }
+
+    public function tablesMetadata(Request $request, $database)
+    {
+        try {
+            $request->merge(['database' => $database]);
+            $this->initializeDriver($request);
+            return Response::json($this->databaseService->getTablesMetadata($database));
+        } catch (\Exception $e) {
+            return Response::json(['error' => $e->getMessage()], 400);
+        }
+    }
 }

backend/app/Services/DatabaseService.php

@@ -138,4 +138,12 @@ class DatabaseService
     {
         return $this->getDriver()->truncateTable($table);
     }
+
+    /**
+     * Get metadata for all tables in a database.
+     */
+    public function getTablesMetadata(string $database): array
+    {
+        return $this->getDriver()->getTablesMetadata($database);
+    }
 }