Feat: Add box connector (#11845)

### What problem does this PR solve?

Feat: Add box connector

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

api/apps/__init__.py

@@ -28,7 +28,6 @@ from api.db.services import UserService
 from api.utils.json_encode import CustomJSONEncoder
 from api.utils import commands
 
-from flask_mail import Mail
 from quart_auth import Unauthorized
 from common import settings
 from api.utils.api_utils import server_error_response
@@ -42,7 +41,6 @@ __all__ = ["app"]
 
 app = Quart(__name__)
 app = cors(app, allow_origin="*")
-smtp_mail_server = Mail()
 
 # Add this at the beginning of your file to configure Swagger UI
 swagger_config = {