refactor: clean up legacy models and migrate remaining schemas

Delete empty stub files from models/database/:
- audit.py, backup.py, configuration.py, monitoring.py
- notification.py, payment.py, search.py, task.py

Delete re-export files:
- models/database/subscription.py → app.modules.billing.models
- models/database/architecture_scan.py → app.modules.dev_tools.models
- models/database/test_run.py → app.modules.dev_tools.models
- models/schema/subscription.py → app.modules.billing.schemas
- models/schema/marketplace.py (empty)
- models/schema/monitoring.py (empty)

Migrate schemas to canonical module locations:
- billing.py → app/modules/billing/schemas/
- vendor_product.py → app/modules/catalog/schemas/
- homepage_sections.py → app/modules/cms/schemas/

Keep as CORE (framework-level, used everywhere):
- models/schema/: admin, auth, base, company, email, image, media, team, vendor*
- models/database/: admin*, base, company, email, feature, media, platform*, user, vendor*

Update 30+ files to use canonical import locations.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

models/database/__init__.py

@@ -32,7 +32,7 @@ from .admin import (
 from app.modules.messaging.models import AdminNotification
 from .admin_menu_config import AdminMenuConfig, FrontendType, MANDATORY_MENU_ITEMS
 from .admin_platform import AdminPlatform
-from .architecture_scan import (
+from app.modules.dev_tools.models import (
     ArchitectureScan,
     ArchitectureViolation,
     ViolationAssignment,
@@ -82,7 +82,7 @@ from app.modules.marketplace.models import OnboardingStatus, OnboardingStep, Ven
 from app.modules.orders.models import Order, OrderItem
 from app.modules.orders.models import OrderItemException
 from app.modules.catalog.models import Product, ProductTranslation
-from .subscription import (
+from app.modules.billing.models import (
     AddOnCategory,
     AddOnProduct,
     BillingHistory,
@@ -95,7 +95,7 @@ from .subscription import (
     VendorAddOn,
     VendorSubscription,
 )
-from .test_run import TestCollection, TestResult, TestRun
+from app.modules.dev_tools.models import TestCollection, TestResult, TestRun
 from .user import User
 from .vendor import Role, Vendor, VendorUser
 from .vendor_domain import VendorDomain

models/database/architecture_scan.py

@@ -1,27 +0,0 @@
-# models/database/architecture_scan.py
-"""
-Architecture Scan Models - LEGACY LOCATION
-
-This file exists for backward compatibility.
-The canonical location is now: app/modules/dev_tools/models/architecture_scan.py
-
-All imports should use the new location:
-    from app.modules.dev_tools.models import ArchitectureScan, ArchitectureViolation, ...
-"""
-
-# Re-export from canonical location for backward compatibility
-from app.modules.dev_tools.models.architecture_scan import (
-    ArchitectureScan,
-    ArchitectureViolation,
-    ArchitectureRule,
-    ViolationAssignment,
-    ViolationComment,
-)
-
-__all__ = [
-    "ArchitectureScan",
-    "ArchitectureViolation",
-    "ArchitectureRule",
-    "ViolationAssignment",
-    "ViolationComment",
-]

models/database/audit.py

@@ -1 +0,0 @@
-# AuditLog, DataExportLog models

models/database/backup.py

@@ -1 +0,0 @@
-# BackupLog, RestoreLog models

models/database/configuration.py

@@ -1 +0,0 @@
-# PlatformConfig, VendorConfig, FeatureFlag models

models/database/monitoring.py

@@ -1 +0,0 @@
-# PerformanceMetric, ErrorLog, SystemAlert models

models/database/notification.py

@@ -1 +0,0 @@
-# NotificationTemplate, NotificationQueue, NotificationLog models

models/database/payment.py

@@ -1 +0,0 @@
-# Payment, PaymentMethod, VendorPaymentConfig models

models/database/search.py

@@ -1 +0,0 @@
-# SearchIndex, SearchQuery models

models/database/subscription.py

@@ -1,53 +0,0 @@
-# models/database/subscription.py
-"""
-Legacy location for subscription models.
-
-MIGRATED: All models have been moved to app.modules.billing.models.subscription.
-
-New location:
-    from app.modules.billing.models import (
-        VendorSubscription,
-        SubscriptionTier,
-        TierCode,
-        SubscriptionStatus,
-    )
-
-This file re-exports from the new location for backward compatibility.
-"""
-
-# Re-export everything from the new canonical location
-from app.modules.billing.models.subscription import (
-    # Enums
-    TierCode,
-    SubscriptionStatus,
-    AddOnCategory,
-    BillingPeriod,
-    # Models
-    SubscriptionTier,
-    AddOnProduct,
-    VendorAddOn,
-    StripeWebhookEvent,
-    BillingHistory,
-    VendorSubscription,
-    CapacitySnapshot,
-    # Legacy constants
-    TIER_LIMITS,
-)
-
-__all__ = [
-    # Enums
-    "TierCode",
-    "SubscriptionStatus",
-    "AddOnCategory",
-    "BillingPeriod",
-    # Models
-    "SubscriptionTier",
-    "AddOnProduct",
-    "VendorAddOn",
-    "StripeWebhookEvent",
-    "BillingHistory",
-    "VendorSubscription",
-    "CapacitySnapshot",
-    # Legacy constants
-    "TIER_LIMITS",
-]

models/database/task.py

@@ -1 +0,0 @@
-# TaskLog model

models/database/test_run.py

@@ -1,23 +0,0 @@
-# models/database/test_run.py
-"""
-Test Run Models - LEGACY LOCATION
-
-This file exists for backward compatibility.
-The canonical location is now: app/modules/dev_tools/models/test_run.py
-
-All imports should use the new location:
-    from app.modules.dev_tools.models import TestRun, TestResult, TestCollection
-"""
-
-# Re-export from canonical location for backward compatibility
-from app.modules.dev_tools.models.test_run import (
-    TestRun,
-    TestResult,
-    TestCollection,
-)
-
-__all__ = [
-    "TestRun",
-    "TestResult",
-    "TestCollection",
-]