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/models.py

@@ -0,0 +1,22 @@
+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