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/users/__init__.py

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+# Users app

backend/apps/users/apps.py

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+from django.apps import AppConfig
+
+
+class UsersConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'apps.users'

backend/apps/users/models.py

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+from django.contrib.auth.models import AbstractUser
+from django.db import models
+
+
+class User(AbstractUser):
+    """Custom user model extending AbstractUser."""
+
+    email = models.EmailField(unique=True)
+    first_name = models.CharField(max_length=150)
+    last_name = models.CharField(max_length=150)
+    avatar = models.ImageField(upload_to='avatars/', null=True, blank=True)
+
+    USERNAME_FIELD = 'email'
+    REQUIRED_FIELDS = ['username', 'first_name']
+
+    class Meta:
+        db_table = 'users'
+        verbose_name = 'User'
+        verbose_name_plural = 'Users'
+
+    def __str__(self):
+        return self.email

backend/apps/users/serializers.py

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+from rest_framework import serializers
+from .models import User
+
+
+class UserSerializer(serializers.ModelSerializer):
+    """Serializer for User model."""
+
+    class Meta:
+        model = User
+        fields = ('id', 'username', 'email', 'first_name', 'last_name', 'avatar')
+        read_only_fields = ('id',)
+
+
+class UserDetailSerializer(serializers.ModelSerializer):
+    """Detailed serializer for User model."""
+
+    class Meta:
+        model = User
+        fields = '__all__'
+        read_only_fields = ('id', 'date_joined', 'last_login')

backend/apps/users/urls.py

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+from django.urls import path, include
+from rest_framework.routers import DefaultRouter
+from .views import UserViewSet
+
+router = DefaultRouter()
+router.register(r'users', UserViewSet, basename='user')
+
+urlpatterns = [
+    path('', include(router.urls)),
+]

backend/apps/users/views.py

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+from rest_framework import viewsets, permissions
+from rest_framework.decorators import action
+from rest_framework.response import Response
+from .models import User
+from .serializers import UserSerializer, UserDetailSerializer
+
+
+class UserViewSet(viewsets.ModelViewSet):
+    """ViewSet for User model."""
+
+    queryset = User.objects.all()
+    permission_classes = [permissions.IsAuthenticated]
+
+    def get_serializer_class(self):
+        if self.action in ['retrieve', 'update', 'partial_update']:
+            return UserDetailSerializer
+        return UserSerializer
+
+    @action(detail=False, methods=['get'])
+    def me(self, request):
+        """Get current user."""
+        serializer = self.get_serializer(request.user)
+        return Response(serializer.data)