Initial commit: WrestleDesk full project

- Django backend with DRF (clubs, wrestlers, trainers, exercises, templates, trainings, homework, locations, leistungstest)
- Next.js 16 frontend with React, Shadcn UI, Tailwind
- JWT authentication
- Full CRUD for all entities
- Calendar view for trainings
- Homework management system
- Leistungstest tracking

backend/auth_app/signals.py

@@ -0,0 +1,10 @@
+from django.db.models.signals import post_save
+from django.dispatch import receiver
+from django.contrib.auth.models import User
+from .models import UserProfile
+
+
+@receiver(post_save, sender=User)
+def create_user_profile(sender, instance, created, **kwargs):
+    if created:
+        UserProfile.objects.create(user=instance)