Add Keycloak group management for member portal access control

- Add portal access control section to EditMemberDialog for admins
- Implement API endpoints for managing member Keycloak groups
- Add group selection UI with user/board/admin access levels
- Enhance admin config with reload functionality
- Support real-time group synchronization and status feedback

utils/types.ts

@@ -133,6 +133,7 @@ export interface Member {
   member_since: string;
   keycloak_id?: string; // New field for linking to Keycloak user
   registration_date?: string; // New field for tracking registration date
+  portal_group?: 'user' | 'board' | 'admin'; // Portal access level group
   
   // Computed fields (added by processing)
   FullName?: string;