feat(billing): add missing payment methods and configurations

- Added migration to include global payment method configurations for Stripe and PayPal (both disabled).
- Ensured existing payment methods like bank transfer and manual payment are correctly configured.
- Added database constraints and indexes for improved data integrity in billing models.
- Introduced foreign key relationship between CreditTransaction and Payment models.
- Added webhook configuration fields to PaymentMethodConfig for future payment gateway integrations.
- Updated SignUpFormUnified component to handle payment method selection based on user country and plan.
- Implemented PaymentHistory component to display user's payment history with status indicators.

backend/igny8_core/auth/urls.py

@@ -46,12 +46,36 @@ class RegisterView(APIView):
     permission_classes = [permissions.AllowAny]
     
     def post(self, request):
+        from .utils import generate_access_token, generate_refresh_token, get_token_expiry
+        from django.contrib.auth import login
+        
         serializer = RegisterSerializer(data=request.data)
         if serializer.is_valid():
             user = serializer.save()
+            
+            # Log the user in (create session for session authentication)
+            login(request, user)
+            
+            # Get account from user
+            account = getattr(user, 'account', None)
+            
+            # Generate JWT tokens
+            access_token = generate_access_token(user, account)
+            refresh_token = generate_refresh_token(user, account)
+            access_expires_at = get_token_expiry('access')
+            refresh_expires_at = get_token_expiry('refresh')
+            
             user_serializer = UserSerializer(user)
             return success_response(
-                data={'user': user_serializer.data},
+                data={
+                    'user': user_serializer.data,
+                    'tokens': {
+                        'access': access_token,
+                        'refresh': refresh_token,
+                        'access_expires_at': access_expires_at.isoformat(),
+                        'refresh_expires_at': refresh_expires_at.isoformat(),
+                    }
+                },
                 message='Registration successful',
                 status_code=status.HTTP_201_CREATED,
                 request=request