feat(fmt): establish formatter runtime boundary

[chenjiahan]

Summary

This PR establishes the runtime boundary for the planned rs fmt command. It pins Prettier 3.9.6 as an Rstack dependency and adds an internal, separately built worker entry without exposing a formatter API or CLI command yet.

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📥 Commits

Reviewing files that changed from the base of the PR and between ab67e68 and 5b51f9b.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (4)

• packages/rstack/package.json
• packages/rstack/rslib.config.ts
• packages/rstack/src/fmt/worker.ts
• pnpm-workspace.yaml

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