Vite + React SPA with 9 pages (Dashboard, Wallets, Vaults, Policies,
Settlements, Bridge, Payments, Audit, Settings) served at /_/mpc/ via
go:embed. Replaces the separate Next.js dashboard pod — the UI now ships
inside the mpcd binary. Uses @tanstack/react-query, wouter hash router,
dark theme, inline styles. Build output: 272KB.
