refactor: migrate schemas to canonical module locations

Migrate remaining legacy schemas to their respective modules:

Marketplace module (app/modules/marketplace/schemas/):
- letzshop.py: Letzshop credentials, orders, fulfillment, sync
- onboarding.py: Vendor onboarding wizard schemas

Catalog module (app/modules/catalog/schemas/):
- product.py: ProductCreate, ProductUpdate, ProductResponse

Payments module (app/modules/payments/schemas/):
- payment.py: PaymentConfig, Stripe, transactions, balance

Delete legacy files:
- models/schema/letzshop.py
- models/schema/onboarding.py
- models/schema/product.py
- models/schema/payment.py
- models/schema/marketplace_product.py (re-export)
- models/schema/marketplace_import_job.py (re-export)
- models/schema/search.py (empty)

Update imports across 19 files to use canonical locations.

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

app/modules/payments/schemas/__init__.py

@@ -3,10 +3,33 @@
 Payments module Pydantic schemas.
 """
 
-from pydantic import BaseModel, Field
 from datetime import datetime
 from typing import Any
 
+from pydantic import BaseModel, Field
+
+from app.modules.payments.schemas.payment import (
+    # Configuration
+    PaymentConfigResponse,
+    PaymentConfigUpdate,
+    PaymentConfigUpdateResponse,
+    # Stripe
+    StripeConnectRequest,
+    StripeConnectResponse,
+    StripeDisconnectResponse,
+    # Methods
+    PaymentMethodInfo,
+    PaymentMethodsResponse,
+    # Transactions
+    TransactionInfo,
+    TransactionsResponse,
+    # Balance
+    PaymentBalanceResponse,
+    # Refunds (config version)
+    PaymentRefundRequest,
+    PaymentRefundResponse,
+)
+
 
 class PaymentRequest(BaseModel):
     """Request to process a payment."""
@@ -83,6 +106,7 @@ class GatewayResponse(BaseModel):
 
 
 __all__ = [
+    # Core payment schemas
     "PaymentRequest",
     "PaymentResponse",
     "RefundRequest",
@@ -90,4 +114,23 @@ __all__ = [
     "PaymentMethodCreate",
     "PaymentMethodResponse",
     "GatewayResponse",
+    # Configuration schemas
+    "PaymentConfigResponse",
+    "PaymentConfigUpdate",
+    "PaymentConfigUpdateResponse",
+    # Stripe integration
+    "StripeConnectRequest",
+    "StripeConnectResponse",
+    "StripeDisconnectResponse",
+    # Payment methods info
+    "PaymentMethodInfo",
+    "PaymentMethodsResponse",
+    # Transactions
+    "TransactionInfo",
+    "TransactionsResponse",
+    # Balance
+    "PaymentBalanceResponse",
+    # Refunds (config version)
+    "PaymentRefundRequest",
+    "PaymentRefundResponse",
 ]