feat: add Usage Limits Panel component with usage tracking and visual indicators for limits

style: implement custom color schemes and gradients for account section, enhancing visual hierarchy

backend/igny8_core/business/billing/urls.py

@@ -7,6 +7,7 @@ from .views import (
     PaymentViewSet,
     CreditPackageViewSet,
     AccountPaymentMethodViewSet,
+    get_usage_summary,
 )
 from igny8_core.modules.billing.views import (
     CreditBalanceViewSet,
@@ -29,4 +30,6 @@ router.register(r'payment-configs', BillingViewSet, basename='payment-configs')
 
 urlpatterns = [
     path('', include(router.urls)),
+    # User-facing usage summary endpoint for plan limits
+    path('usage-summary/', get_usage_summary, name='usage-summary'),
 ]