Initial commit: React + Django full-stack project setup

- Backend: Django 4.2 + DRF + JWT + GraphQL
- Frontend: React 18 + MobX + styled-components
- Deployment: Docker + Docker Compose + Nginx
- Database: PostgreSQL support
- Documentation: README, INIT, PROJECT_DOCS, TESTING

backend/apps/api/serializers.py

@@ -0,0 +1,29 @@
+from rest_framework import serializers
+from django.contrib.auth import get_user_model
+from rest_framework_simplejwt.serializers import TokenObtainPairSerializer
+
+User = get_user_model()
+
+
+class CustomTokenObtainPairSerializer(TokenObtainPairSerializer):
+    """Custom JWT token serializer that includes user data."""
+
+    @classmethod
+    def get_token(cls, user):
+        token = super().get_token(user)
+        # Add custom claims
+        token['email'] = user.email
+        token['username'] = user.username
+        return token
+
+    def validate(self, attrs):
+        data = super().validate(attrs)
+        # Add user data to response
+        data['user'] = {
+            'id': self.user.id,
+            'email': self.user.email,
+            'username': self.user.username,
+            'first_name': self.user.first_name,
+            'last_name': self.user.last_name,
+        }
+        return data