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/wrestlers/serializers.py

@@ -0,0 +1,15 @@
+from rest_framework import serializers
+from .models import Wrestler
+
+
+class WrestlerSerializer(serializers.ModelSerializer):
+    club_name = serializers.CharField(source='club.name', read_only=True)
+    age = serializers.SerializerMethodField()
+    
+    class Meta:
+        model = Wrestler
+        fields = '__all__'
+        read_only_fields = ['created_at', 'updated_at', 'age']
+    
+    def get_age(self, obj):
+        return obj.calculate_age()