feat(12-04): setup API client functions + SetupPage wizard component
- Add 7 setup functions to client.ts: fetchSetupStatus, postSetupConfig, validateSetupDb, validateSetupOidc, validateSetupVapid, postSetupCredential, postSetupComplete; plus SetupAlreadyLockedError for 423 handling - Add SetupPage.tsx: standalone 4-step wizard (Welcome → Instance Configuration → Calendar Credential → Terminal/Locked) with Surface 2 step indicator, Surface 5 validation rows, Surface 6 action row, Surface 7 terminal screen, Surface 8 already-locked screen; role=main, aria-live, no nav shell - No dangerouslySetInnerHTML; no AppNav/BottomTabBar imports - All 230 pwa tests pass; typecheck clean; build green
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