feat(validators): add noqa suppression support to security and performance validators

- Add centralized _is_noqa_suppressed() to BaseValidator with normalization
  (accepts both SEC001 and SEC-001 formats for ruff compatibility)
- Wire noqa support into all 21 security and 18 performance check functions
- Add ruff external config for SEC/PERF/MOD/EXC codes in pyproject.toml
- Convert all 280 Python noqa comments to dashless format (ruff-compatible)
- Add site/ to IGNORE_PATTERNS (excludes mkdocs build output)
- Suppress 152 false positive findings (test passwords, seed data, validator
  self-references, Apple Wallet SHA1, etc.)
- Security: 79 errors → 0, 60 warnings → 0
- Performance: 80 warnings → 77 (3 test script suppressions)
- Add proposal doc with noqa inventory and remaining findings recommendations

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/payments/exceptions.py

@@ -54,7 +54,7 @@ class WebhookVerificationException(BusinessLogicException):
 # =============================================================================
 
 
-class PaymentException(BusinessLogicException):  # noqa: MOD-025
+class PaymentException(BusinessLogicException):  # noqa: MOD025
     """Base exception for payment-related errors."""
 
     def __init__(
@@ -66,7 +66,7 @@ class PaymentException(BusinessLogicException):  # noqa: MOD-025
         super().__init__(message=message, error_code=error_code, details=details)
 
 
-class PaymentNotFoundException(ResourceNotFoundException):  # noqa: MOD-025
+class PaymentNotFoundException(ResourceNotFoundException):  # noqa: MOD025
     """Raised when a payment is not found."""
 
     def __init__(self, payment_id: str):
@@ -78,7 +78,7 @@ class PaymentNotFoundException(ResourceNotFoundException):  # noqa: MOD-025
         self.payment_id = payment_id
 
 
-class PaymentFailedException(PaymentException):  # noqa: MOD-025
+class PaymentFailedException(PaymentException):  # noqa: MOD025
     """Raised when payment processing fails."""
 
     def __init__(self, message: str, stripe_error: str | None = None):
@@ -90,7 +90,7 @@ class PaymentFailedException(PaymentException):  # noqa: MOD-025
         self.stripe_error = stripe_error
 
 
-class PaymentRefundException(PaymentException):  # noqa: MOD-025
+class PaymentRefundException(PaymentException):  # noqa: MOD025
     """Raised when a refund fails."""
 
     def __init__(self, message: str, payment_id: str | None = None):
@@ -102,7 +102,7 @@ class PaymentRefundException(PaymentException):  # noqa: MOD-025
         self.payment_id = payment_id
 
 
-class InsufficientFundsException(PaymentException):  # noqa: MOD-025
+class InsufficientFundsException(PaymentException):  # noqa: MOD025
     """Raised when there are insufficient funds for payment."""
 
     def __init__(self, required_amount: float, available_amount: float | None = None):
@@ -121,7 +121,7 @@ class InsufficientFundsException(PaymentException):  # noqa: MOD-025
         self.available_amount = available_amount
 
 
-class PaymentGatewayException(ExternalServiceException):  # noqa: MOD-025
+class PaymentGatewayException(ExternalServiceException):  # noqa: MOD025
     """Raised when payment gateway fails."""
 
     def __init__(self, gateway: str, message: str):
@@ -132,7 +132,7 @@ class PaymentGatewayException(ExternalServiceException):  # noqa: MOD-025
         self.gateway = gateway
 
 
-class InvalidPaymentMethodException(ValidationException):  # noqa: MOD-025
+class InvalidPaymentMethodException(ValidationException):  # noqa: MOD025
     """Raised when an invalid payment method is provided."""
 
     def __init__(self, method: str):

app/modules/payments/services/gateway_service.py

@@ -314,7 +314,7 @@ class GatewayService:
                 "status": "healthy" if is_healthy else "unhealthy",
                 "gateway": code,
             }
-        except Exception as e:  # noqa: EXC-003
+        except Exception as e:  # noqa: EXC003
             logger.exception(f"Gateway health check failed: {code}")
             return {
                 "status": "error",