refactor: enforce strict architecture rules and add Pydantic response models

- Update architecture rules to be stricter (API-003 now blocks ALL exception
  raising in endpoints, not just HTTPException)
- Update get_current_vendor_api dependency to guarantee token_vendor_id presence
- Remove redundant _get_vendor_from_token helpers from all vendor API files
- Move vendor access validation to service layer methods
- Add Pydantic response models for media, notification, and payment endpoints
- Add get_active_vendor_by_code service method for public vendor lookup
- Add get_import_job_for_vendor service method with vendor validation
- Update validation script to detect exception raising patterns in endpoints

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

models/schema/payment.py

@@ -1 +1,166 @@
-# Payment models
+# models/schema/payment.py
+"""
+Payment Pydantic schemas for API validation and responses.
+
+This module provides schemas for:
+- Payment configuration
+- Stripe integration
+- Payment methods
+- Transactions and balance
+- Refunds
+"""
+
+from datetime import datetime
+from typing import Any
+
+from pydantic import BaseModel, Field
+
+
+# ============================================================================
+# PAYMENT CONFIGURATION SCHEMAS
+# ============================================================================
+
+
+class PaymentConfigResponse(BaseModel):
+    """Response for payment configuration."""
+
+    payment_gateway: str | None = None
+    accepted_methods: list[str] = []
+    currency: str = "EUR"
+    stripe_connected: bool = False
+    stripe_account_id: str | None = None
+    paypal_connected: bool = False
+    message: str | None = None
+
+
+class PaymentConfigUpdate(BaseModel):
+    """Request model for updating payment configuration."""
+
+    payment_gateway: str | None = Field(None, max_length=50)
+    accepted_methods: list[str] | None = None
+    currency: str | None = Field(None, max_length=3)
+
+
+class PaymentConfigUpdateResponse(BaseModel):
+    """Response for payment configuration update."""
+
+    success: bool = False
+    message: str | None = None
+
+
+# ============================================================================
+# STRIPE INTEGRATION SCHEMAS
+# ============================================================================
+
+
+class StripeConnectRequest(BaseModel):
+    """Request model for connecting Stripe account."""
+
+    authorization_code: str | None = None
+    state: str | None = None
+
+
+class StripeConnectResponse(BaseModel):
+    """Response for Stripe connection."""
+
+    connected: bool = False
+    stripe_account_id: str | None = None
+    message: str | None = None
+
+
+class StripeDisconnectResponse(BaseModel):
+    """Response for Stripe disconnection."""
+
+    disconnected: bool = False
+    message: str | None = None
+
+
+# ============================================================================
+# PAYMENT METHODS SCHEMAS
+# ============================================================================
+
+
+class PaymentMethodInfo(BaseModel):
+    """Information about a payment method."""
+
+    id: str
+    name: str
+    type: str  # credit_card, paypal, bank_transfer, etc.
+    enabled: bool = True
+    icon: str | None = None
+
+
+class PaymentMethodsResponse(BaseModel):
+    """Response for payment methods listing."""
+
+    methods: list[PaymentMethodInfo] = []
+    message: str | None = None
+
+
+# ============================================================================
+# TRANSACTION SCHEMAS
+# ============================================================================
+
+
+class TransactionInfo(BaseModel):
+    """Information about a payment transaction."""
+
+    id: int
+    order_id: int | None = None
+    amount: float
+    currency: str = "EUR"
+    status: str  # pending, completed, failed, refunded
+    payment_method: str | None = None
+    customer_email: str | None = None
+    created_at: datetime
+    completed_at: datetime | None = None
+    metadata: dict[str, Any] | None = None
+
+
+class TransactionsResponse(BaseModel):
+    """Response for payment transactions listing."""
+
+    transactions: list[TransactionInfo] = []
+    total: int = 0
+    skip: int = 0
+    limit: int = 50
+    message: str | None = None
+
+
+# ============================================================================
+# BALANCE SCHEMAS
+# ============================================================================
+
+
+class PaymentBalanceResponse(BaseModel):
+    """Response for payment balance information."""
+
+    available_balance: float = 0.0
+    pending_balance: float = 0.0
+    currency: str = "EUR"
+    next_payout_date: datetime | None = None
+    last_payout_date: datetime | None = None
+    last_payout_amount: float | None = None
+    message: str | None = None
+
+
+# ============================================================================
+# REFUND SCHEMAS
+# ============================================================================
+
+
+class RefundRequest(BaseModel):
+    """Request model for processing a refund."""
+
+    amount: float | None = Field(None, gt=0, description="Partial refund amount, or None for full refund")
+    reason: str | None = Field(None, max_length=500)
+
+
+class RefundResponse(BaseModel):
+    """Response for refund operation."""
+
+    refund_id: int | None = None
+    payment_id: int | None = None
+    amount: float | None = None
+    status: str | None = None  # pending, completed, failed
+    message: str | None = None