chore: migrate monorepo to Vite+

[xinyao27]

Summary

• move pnpm 11 settings out of package.json and into pnpm-workspace.yaml
• migrate the monorepo to Vite+ 0.2.5 for tasks, formatting, linting, and tests
• replace Turbo task configs and standalone Vitest configs with workspace/package Vite+ configs
• rewrite Vitest imports to vite-plus/test and keep Electron, Cloudflare, and Void build boundaries intact
• update workspace dependencies and add compatibility fixes for Electron 43, Electron Vite 5, Vitest 4, and Cloudflare Workers types
• establish the one-time Oxfmt baseline across the repository

Verification

• pnpm i
• pnpm peers check
• vp check --fix
• pnpm run typecheck
• pnpm test (1,718 passed, 1 skipped)
• pnpm run build

Notes

This PR intentionally includes the repository-wide Oxfmt/import normalization generated by the Vite+ migration. The two local-only backend Wrangler environment files were excluded from the branch.