feat: optimize Docker build, implement POST endpoints, update MEC033...

feat: optimize Docker build, implement POST endpoints, update MEC033 registration, and align CSE branches

- Modified Dockerfile to reduce build time and final image size.
- Implemented POST request handling for:
  1) /applications/{appInstanceId}/confirm_ready
  2) /applications/{appInstanceId}/services
- Updated request bodies for MEC 033 registration endpoint.
- Both ACME IN-cse and MN-cse now use the master branch.