AI MODELS & final updates - feat: Implement AI Model Configuration with dynamic pricing and REST API

- Added AIModelConfig model to manage AI model configurations in the database.
- Created serializers and views for AI model configurations, enabling read-only access via REST API.
- Implemented filtering capabilities for model type, provider, and default status in the API.
- Seeded initial data for text and image models, including pricing and capabilities.
- Updated Django Admin interface for managing AI models with enhanced features and bulk actions.
- Added validation methods for model and image size checks.
- Comprehensive migration created to establish the AIModelConfig model and seed initial data.
- Documented implementation and validation results in summary and report files.

backend/igny8_core/business/billing/urls.py

@@ -13,6 +13,7 @@ from igny8_core.modules.billing.views import (
     CreditBalanceViewSet,
     CreditUsageViewSet,
     CreditTransactionViewSet,
+    AIModelConfigViewSet,
 )
 
 router = DefaultRouter()
@@ -21,6 +22,8 @@ router.register(r'admin', BillingViewSet, basename='billing-admin')
 router.register(r'credits/balance', CreditBalanceViewSet, basename='credit-balance')
 router.register(r'credits/usage', CreditUsageViewSet, basename='credit-usage')
 router.register(r'credits/transactions', CreditTransactionViewSet, basename='credit-transactions')
+# AI Models endpoint
+router.register(r'ai/models', AIModelConfigViewSet, basename='ai-models')
 # User-facing billing endpoints
 router.register(r'invoices', InvoiceViewSet, basename='invoices')
 router.register(r'payments', PaymentViewSet, basename='payments')