v0.0.12

Refactor route files for improved organization and readability

- Updated `mod.rs` to include `vps_routes`.
- Cleaned up imports and formatting in `notification_routes.rs`, `oauth_routes.rs`, `service_monitor_routes.rs`, `tag_routes.rs`, `user_routes.rs`, and `vps_routes.rs`.
- Enhanced error handling and response formatting across various route handlers.
- Improved code consistency by aligning formatting and structuring of route definitions.
- Added comments for clarity in several route handlers.