Add read-only admin functionality and enhance billing models in admin interface

backend/igny8_core/business/billing/admin.py

@@ -3,7 +3,15 @@ Billing Business Logic Admin
 """
 from django.contrib import admin
 from django.utils.html import format_html
-from .models import CreditCostConfig, AccountPaymentMethod
+from igny8_core.admin.base import AccountAdminMixin
+from .models import (
+    CreditCostConfig,
+    AccountPaymentMethod,
+    Invoice,
+    Payment,
+    CreditPackage,
+    PaymentMethodConfig,
+)
 
 
 @admin.register(CreditCostConfig)
@@ -81,6 +89,56 @@ class CreditCostConfigAdmin(admin.ModelAdmin):
         super().save_model(request, obj, form, change)
 
 
+@admin.register(Invoice)
+class InvoiceAdmin(AccountAdminMixin, admin.ModelAdmin):
+    list_display = [
+        'invoice_number',
+        'account',
+        'status',
+        'total',
+        'currency',
+        'invoice_date',
+        'due_date',
+        'subscription',
+    ]
+    list_filter = ['status', 'currency', 'invoice_date', 'account']
+    search_fields = ['invoice_number', 'account__name', 'subscription__id']
+    readonly_fields = ['created_at', 'updated_at']
+
+
+@admin.register(Payment)
+class PaymentAdmin(AccountAdminMixin, admin.ModelAdmin):
+    list_display = [
+        'id',
+        'invoice',
+        'account',
+        'payment_method',
+        'status',
+        'amount',
+        'currency',
+        'processed_at',
+    ]
+    list_filter = ['status', 'payment_method', 'currency', 'created_at']
+    search_fields = ['invoice__invoice_number', 'account__name', 'stripe_payment_intent_id', 'paypal_order_id']
+    readonly_fields = ['created_at', 'updated_at']
+
+
+@admin.register(CreditPackage)
+class CreditPackageAdmin(admin.ModelAdmin):
+    list_display = ['name', 'slug', 'credits', 'price', 'discount_percentage', 'is_active', 'is_featured', 'sort_order']
+    list_filter = ['is_active', 'is_featured']
+    search_fields = ['name', 'slug']
+    readonly_fields = ['created_at', 'updated_at']
+
+
+@admin.register(PaymentMethodConfig)
+class PaymentMethodConfigAdmin(admin.ModelAdmin):
+    list_display = ['country_code', 'payment_method', 'is_enabled', 'display_name', 'sort_order']
+    list_filter = ['payment_method', 'is_enabled', 'country_code']
+    search_fields = ['country_code', 'display_name', 'payment_method']
+    readonly_fields = ['created_at', 'updated_at']
+
+
 @admin.register(AccountPaymentMethod)
 class AccountPaymentMethodAdmin(admin.ModelAdmin):
     list_display = [

backend/igny8_core/business/integration/admin.py

@@ -0,0 +1,36 @@
+from django.contrib import admin
+from igny8_core.admin.base import AccountAdminMixin
+from .models import SiteIntegration, SyncEvent
+
+
+@admin.register(SiteIntegration)
+class SiteIntegrationAdmin(AccountAdminMixin, admin.ModelAdmin):
+    list_display = [
+        'site',
+        'platform',
+        'platform_type',
+        'is_active',
+        'sync_enabled',
+        'sync_status',
+        'last_sync_at',
+    ]
+    list_filter = ['platform', 'platform_type', 'is_active', 'sync_enabled', 'sync_status']
+    search_fields = ['site__name', 'site__domain', 'platform']
+    readonly_fields = ['created_at', 'updated_at']
+
+
+@admin.register(SyncEvent)
+class SyncEventAdmin(AccountAdminMixin, admin.ModelAdmin):
+    list_display = [
+        'integration',
+        'site',
+        'event_type',
+        'action',
+        'success',
+        'external_id',
+        'created_at',
+    ]
+    list_filter = ['event_type', 'action', 'success', 'created_at']
+    search_fields = ['integration__site__name', 'site__name', 'description', 'external_id']
+    readonly_fields = ['created_at']
+

backend/igny8_core/business/optimization/admin.py

@@ -0,0 +1,12 @@
+from django.contrib import admin
+from igny8_core.admin.base import AccountAdminMixin
+from .models import OptimizationTask
+
+
+@admin.register(OptimizationTask)
+class OptimizationTaskAdmin(AccountAdminMixin, admin.ModelAdmin):
+    list_display = ['content', 'account', 'status', 'credits_used', 'created_at']
+    list_filter = ['status', 'created_at']
+    search_fields = ['content__title', 'account__name']
+    readonly_fields = ['created_at', 'updated_at']
+

backend/igny8_core/business/publishing/admin.py

@@ -0,0 +1,36 @@
+from django.contrib import admin
+from igny8_core.admin.base import SiteSectorAdminMixin
+from .models import PublishingRecord, DeploymentRecord
+
+
+@admin.register(PublishingRecord)
+class PublishingRecordAdmin(SiteSectorAdminMixin, admin.ModelAdmin):
+    list_display = [
+        'content',
+        'site',
+        'sector',
+        'destination',
+        'status',
+        'destination_url',
+        'published_at',
+    ]
+    list_filter = ['destination', 'status', 'site']
+    search_fields = ['content__title', 'destination', 'destination_url']
+    readonly_fields = ['created_at', 'updated_at']
+
+
+@admin.register(DeploymentRecord)
+class DeploymentRecordAdmin(SiteSectorAdminMixin, admin.ModelAdmin):
+    list_display = [
+        'site',
+        'sector',
+        'version',
+        'deployed_version',
+        'status',
+        'deployment_url',
+        'deployed_at',
+    ]
+    list_filter = ['status', 'site']
+    search_fields = ['site__name', 'deployment_url']
+    readonly_fields = ['created_at', 'updated_at']
+