fix: support pnpm 11 installs

[myeolinmalchi]

Summary

• Pin root, frontend, and CI package managers to pnpm 11.5.2
• Raise the documented/runtime Node.js floor to 22.13 for pnpm 11.5.2 compatibility
• Add pnpm 11 build approvals and move hoist config into pnpm-workspace.yaml
• Surface launch server logs and avoid npx for local CLIs
• Update install docs with the pinned pnpm version and Corepack fallback guidance

Verification

• pnpm install --frozen-lockfile
• pnpm ignored-builds
• cd frontend && pnpm install --frozen-lockfile
• cd frontend && pnpm ignored-builds
• pnpm format:check
• pnpm lint
• cd frontend && pnpm exec tsc --noEmit --pretty false
• pnpm build
• pnpm launch (verified setup prompt starts)