feat(rn): [P1] Automations list + CRUD MVP

[liuyidi]

Summary

Automations hub MVP: list, create (message + schedule), enable/disable, delete, run now. Runs history can be phase 2; templates phase 2.

WebUI reference

• webui/src/pages/automations/AutomationsPage.tsx
• webui/src/pages/automations/automations-ui.tsx

API

• /api/webui/automations CRUD + enable/disable/run (see webui/src/lib/apis/api.ts)

RN landing

• New src/app/automations/ stack or surface via Discover first
• List + create/edit Sheet

Acceptance

• Create task visible for same account in WebUI
• Enable/disable / delete / run now work

Depends

• chore: Settings API thin wrapper (or shared automations helpers)