free and trial plans fixes and styling of sigini and signup forms

backend/igny8_core/auth/serializers.py

@@ -320,10 +320,18 @@ class RegisterSerializer(serializers.Serializer):
         if 'plan_id' in attrs and attrs.get('plan_id') == '':
             attrs['plan_id'] = None
         
-        # Validate billing fields for paid plans
+        # Validate billing fields for paid plans (check by price, not hardcoded slugs)
         plan_slug = attrs.get('plan_slug')
-        paid_plans = ['starter', 'growth', 'scale']
-        if plan_slug and plan_slug in paid_plans:
+        if plan_slug:
+            try:
+                plan = Plan.objects.get(slug=plan_slug, is_active=True)
+                is_paid_plan = plan.price > 0
+            except Plan.DoesNotExist:
+                raise serializers.ValidationError({"plan": f"Plan '{plan_slug}' not found."})
+        else:
+            is_paid_plan = False
+        
+        if is_paid_plan:
             # Require billing_country for paid plans
             if not attrs.get('billing_country'):
                 raise serializers.ValidationError({
@@ -348,27 +356,36 @@ class RegisterSerializer(serializers.Serializer):
         
         with transaction.atomic():
             plan_slug = validated_data.get('plan_slug')
-            paid_plans = ['starter', 'growth', 'scale']
             
-            if plan_slug and plan_slug in paid_plans:
+            # Fetch plan and determine paid/free by price, not hardcoded slugs
+            if plan_slug:
                 try:
                     plan = Plan.objects.get(slug=plan_slug, is_active=True)
                 except Plan.DoesNotExist:
                     raise serializers.ValidationError({
                         "plan": f"Plan '{plan_slug}' not available. Please contact support."
                     })
+            else:
+                # No plan_slug provided, get first free plan (price=0)
+                try:
+                    plan = Plan.objects.filter(is_active=True, price=0).first()
+                    if not plan:
+                        raise Plan.DoesNotExist
+                except Plan.DoesNotExist:
+                    raise serializers.ValidationError({
+                        "plan": "No free plan available. Please contact support."
+                    })
+            
+            # Determine account status based on plan price
+            is_paid_plan = plan.price > 0
+            
+            if is_paid_plan:
                 account_status = 'pending_payment'
                 initial_credits = 0
                 billing_period_start = timezone.now()
                 # simple monthly cycle; if annual needed, extend here
                 billing_period_end = billing_period_start + timedelta(days=30)
             else:
-                try:
-                    plan = Plan.objects.get(slug='free', is_active=True)
-                except Plan.DoesNotExist:
-                    raise serializers.ValidationError({
-                        "plan": "Free plan not configured. Please contact support."
-                    })
                 account_status = 'trial'
                 initial_credits = plan.get_effective_credits_per_month()
                 billing_period_start = None