Add POST /org/tenants/:id/admins so org admins can provision the first
login for a chapter's admin team. New chapter admins can then sign in at
/login with email + password.
- OrgService.createTenantAdmin — validates chapter belongs to org, hashes
password, creates Admin record
- OrgController POST tenants/:id/admins endpoint
- BFF route /api/org/tenants/[id]/admins
- Add Admin form on /org/tenants/[id] page (email, password, role select)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
maaz519
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