[FEAT] - Add CI check to validate 'uv.lock' is up-to-date

[DhavalGojiya]

Summary

This PR adds a GitHub Actions job to validate the uv.lock file and ensure it is consistent with pyproject.toml

Changes

• Added a new job: UV Lockfile Sync Validation 🔒

  • Checks uv.lock consistency using uv lock --locked

• Ensures that CI fails if the lockfile is out of sync.

Benefits

• Prevents out-of-sync dependencies from entering the codebase.
• Improves CI reliability by catching lockfile issues early.
• Maintains consistent environment across all contributors and CI runners.

How to Test / Verify

1. Push changes to a branch with an outdated uv.lock.
2. Observe that the CI fails the lockfile check.
3. Update the lockfile with uv lock and verify that CI passes.

[DhavalGojiya]

@cunla

✅ Successfully rebased the latest master branch into the current branch DhavalGojiya:ci/lockfile-validation-uv .
The PR now contains one single, clean linear commit.