feat(10-04): extend client.ts — MeUser.isAdmin+needsProviderSetup + admin/self-service fetchers
- Add isAdmin and needsProviderSetup to MeUser interface (D-03 UX gating)
- Add AdminMember, SaveCredentialPayload, AdminCalendar, SaveMyCredentialPayload types
- Add fetchAdminMembers, saveCredential, fetchAdminCalendars, setSharedCalendar fetchers
- Add saveMyCredential (self-service, no userId field — T-10-12/Pitfall 6)
- All fetchers use credentials:'include', redirect:'manual', handleAuthResponse
- Password never logged or stored beyond in-flight request body (T-10-15)
Lucas Berger
bfe1eff5a3