build: add Socket optimized pnpm overrides (#2600)

## Summary

- Add Socket optimized registry overrides for supported transitive
dependencies.
- Regenerate the root pnpm lockfile with the Socket registry packages.
- Add Socket GitHub App configuration scoped to dependency manifest and
lockfile changes.

## Test plan

- `sfw pnpm install --lockfile-only --no-frozen-lockfile`
- `git diff --check`
- JSON/YAML parsing for `package.json` and `socket.yml`

The install reported existing workspace peer/deprecation warnings and a
missing docs patch path.

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Co-authored-by: John Kennedy <jkennedyvz@users.noreply.github.com>