feat: frontend member management

- Leden pagina met VDataTable, rol chips, uitnodigingen sectie
- InviteMemberDialog + EditMemberRoleDialog
- Publieke acceptatiepagina /invitations/[token]
- Router guard uitgebreid met requiresAuth: false support
- MemberCollection backend uitgebreid met volledige pending_invitations lijst

apps/app/src/plugins/1.router/guards.ts

@@ -12,7 +12,7 @@ export function setupGuards(router: Router) {
     }
 
     // Protected pages: redirect to login if not authenticated
-    if (!isPublic && !authStore.isAuthenticated) {
+    if (!isPublic && !authStore.isAuthenticated && to.meta.requiresAuth !== false) {
       return { path: '/login', query: { to: to.fullPath } }
     }
   })