chore: remove tracked build-cache leftovers + sync pnpm lockfile

- Drop the .cppjs/ci/* files that were tracked under the mobile
  reactnative-cli samples. These are intermediate cppjs build outputs
  (interface/, bridge/, cache.json) — they're regenerated locally and
  belong in .gitignore, not in the repo.
- Update pnpm-lock.yaml to reflect the workspace state after the
  main merge (new sample workspaces in cppjs-core-create-app's
  dependencies caused fresh resolutions).

Author: erenkucuker