chore: migrate workspace to moon/proto node stack

[Hebilicious]

Summary

• migrate from deno-root layout to a Node + pnpm workspace layout
• move package logic under packages/cssforge and add moon v2 project/task configuration
• migrate package scripts into moon tasks and remove scripts blocks from repo package manifests
• keep JSR publishing support via moon tasks and update release automation
• add example projects and task wiring for e2e/dev flows

Verification

• ran CI-equivalent workflow locally:
  • proto install
  • proto run pnpm -- install --frozen-lockfile
  • moon run :format
  • moon run :test
  • moon run :typecheck

Supersedes #16 (opened from the wrong branch).

[changeset-bot]

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Latest commit: 5555028

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