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/auth/serializers.py

@@ -13,6 +13,9 @@ class PlanSerializer(serializers.ModelSerializer):
             'id', 'name', 'slug', 'price', 'billing_cycle', 'annual_discount_percent', 
             'is_featured', 'features', 'is_active',
             'max_users', 'max_sites', 'max_industries', 'max_author_profiles',
+            'max_keywords', 'max_clusters',
+            'max_content_ideas', 'max_content_words', 
+            'max_images_basic', 'max_images_premium', 'max_image_prompts',
             'included_credits', 'extra_credit_price', 'allow_credit_topup',
             'auto_credit_topup_threshold', 'auto_credit_topup_amount',
             'stripe_product_id', 'stripe_price_id', 'credits_per_month'