feat: implement user management system

- Add role field to UserProfile (superadmin/admin/trainer)
- Add role-based permission classes
- Create UserManagementViewSet with CRUD and password change
- Add API types and components for user management
- Create users management page in settings
- Only superadmins can manage users

backend/wrestleDesk/urls.py

@@ -13,7 +13,7 @@ from exercises.views import ExerciseViewSet
 from templates.views import TrainingTemplateViewSet, TemplateExerciseViewSet
 from trainings.views import TrainingViewSet, AttendanceViewSet, TrainingExerciseViewSet
 from homework.views import HomeworkViewSet, HomeworkExerciseItemViewSet, HomeworkAssignmentViewSet, HomeworkStatusViewSet, TrainingHomeworkAssignmentViewSet
-from auth_app.views import login, register, refresh_token, me, user_preferences
+from auth_app.views import UserManagementViewSet, login, register, refresh_token, me, user_preferences
 from stats.views import dashboard_stats
 from leistungstest.views import LeistungstestStatsViewSet
 
@@ -34,6 +34,7 @@ router.register(r'homework-assignments', HomeworkAssignmentViewSet, basename='ho
 router.register(r'homework-status', HomeworkStatusViewSet, basename='homework-status')
 router.register(r'training-assignments', TrainingHomeworkAssignmentViewSet, basename='training-assignment')
 router.register(r'leistungstest-stats', LeistungstestStatsViewSet, basename='leistungstest-stats')
+router.register(r'auth/users', UserManagementViewSet, basename='usermanagement')
 
 urlpatterns = [
     path('admin/', admin.site.urls),