feat: implement MySQL driver and API schema services for database management

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

@@ -104,4 +104,54 @@ class SchemaController extends Controller
             return Response::json(['error' => $e->getMessage()], 400);
         }
     }
+
+    public function export(Request $request)
+    {
+        try {
+            $this->initializeDriver($request);
+            $config = $request->only(['host', 'username', 'password', 'database', 'port']);
+            $filePath = $this->databaseService->export($config);
+            
+            return Response::download($filePath)->deleteFileAfterSend(true);
+        } catch (\Exception $e) {
+            return Response::json(['error' => $e->getMessage()], 400);
+        }
+    }
+
+    public function import(Request $request)
+    {
+        try {
+            if (!$request->hasFile('file')) {
+                return Response::json(['error' => 'No file uploaded'], 400);
+            }
+
+            $this->initializeDriver($request);
+            $config = $request->only(['host', 'username', 'password', 'database', 'port']);
+            
+            $file = $request->file('file');
+            $tempPath = $file->storeAs('temp', $file->getClientOriginalName());
+            $fullPath = storage_path('app/' . $tempPath);
+            
+            $this->databaseService->import($config, $fullPath);
+            
+            if (file_exists($fullPath)) {
+                unlink($fullPath);
+            }
+            
+            return Response::json(['message' => 'Database imported successfully']);
+        } catch (\Exception $e) {
+            return Response::json(['error' => $e->getMessage()], 400);
+        }
+    }
+
+    public function metadata(Request $request, $database)
+    {
+        try {
+            $request->merge(['database' => $database]);
+            $this->initializeDriver($request);
+            return Response::json($this->databaseService->getDatabaseMetadata($database));
+        } catch (\Exception $e) {
+            return Response::json(['error' => $e->getMessage()], 400);
+        }
+    }
 }