Introduces Zod 4 schemas for response validation on the three highest-traffic
endpoints (server/status, nodes/list, setting/all) and a Zod->AntD form rule
adapter, replacing the duplicated per-file ApiMsg<T> interfaces. Validation
runs safeParse with console.warn + raw-payload fallback so backend drift never
breaks the UI for users.
Login form switches to schema-driven rules as the proof-of-life for the
adapter. Class-based models stay untouched; remaining query/mutation hooks
and form modals will migrate in follow-ups.