Fix: Correct proof setting and status update in StrataSequencerApiServer

[MdTeach]

Description

This PR fixes a bug in the StrataSequencerApiServer implementation where proof setting and proving status updates were incorrectly handled.

Type of Change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature/Enhancement (non-breaking change which adds functionality or enhances an existing one)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update
• [ ] Refactor

Checklist

• [ ] I have performed a self-review of my code.
• [ ] I have commented my code where necessary.
• [ ] I have updated the documentation if needed.
• [ ] My changes do not introduce new warnings.
• [ ] I have added tests that prove my changes are effective or that my feature works.
• [ ] New and existing tests pass with my changes.

Related Issues

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 57.01%. Comparing base (7664bb7) to head (544f147). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
bin/strata-client/src/rpc_server.rs	0.00%	5 Missing :warning:

@@            Coverage Diff             @@
##             main     #383      +/-   ##
==========================================
- Coverage   57.13%   57.01%   -0.12%     
==========================================
  Files         254      254              
  Lines       26788    26789       +1     
==========================================
- Hits        15304    15274      -30     
- Misses      11484    11515      +31     

Files with missing lines	Coverage Δ
bin/strata-client/src/rpc_server.rs	0.00% <0.00%> (ø)

... and 7 files with indirect coverage changes