Restrict team_role and brands to admin-only editing

- Remove team_role and brands from profile completion wizard
- Lock team_role and brands fields when user edits own profile
- Remove team_role and brands from PATCH /users/me/profile endpoint
- Profile completeness now checks name instead of team_role

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/pages/Team.jsx

@@ -43,8 +43,6 @@ export default function Team() {
       if (isEditingSelf) {
         await api.patch('/users/me/profile', {
           name: data.name,
-          team_role: data.role,
-          brands: data.brands,
           phone: data.phone,
         })
       } else {