Add missing organization features for Teams functionality:
- PUT /auth/organizations/:id - update organization
- DELETE /auth/organizations/:id - delete organization
- PATCH /auth/organizations/:orgId/members/:memberId/role - update member role
- GET /auth/organizations/:id/invitations - list org invitations
- GET /auth/invitations - list user invitations
- DELETE /auth/invitations/:id - cancel or reject invitation
