fix(config): add default value for secret key

- Set a default value for the secret key to prevent potential application errors during deployment.
- Ensure an empty default while emphasizing the need for a strong, unique key in production environments.

api/configs/feature/__init__.py

@@ -15,6 +15,7 @@ class SecurityConfig(BaseSettings):
         description="Secret key for secure session cookie signing."
         "Make sure you are changing this key for your deployment with a strong key."
         "Generate a strong key using `openssl rand -base64 42` or set via the `SECRET_KEY` environment variable.",
+        default="",
     )
 
     RESET_PASSWORD_TOKEN_EXPIRY_HOURS: PositiveInt = Field(