Improve handler error handling and Swagger docs

[retr0-kernel]

Enhance error handling and validation in API handlers (can start with application.go and audit.go and after a successful review and continue with other handlers) Update Swagger comments to document all error responses (422, 500, etc.)

[LunaWhispers]

Thank you very much for your interest in dragonfly, there is the following to clarify:

1. The parameter verification has been completed in the annotation, refer to https://github.com/dragonflyoss/dragonfly/blob/main/manager/types/audit.go#L40.
2. A unified error handling approach is desirable.