style: apply black and isort formatting across entire codebase

- Standardize quote style (single to double quotes)
- Reorder and group imports alphabetically
- Fix line breaks and indentation for consistency
- Apply PEP 8 formatting standards

Also updated Makefile to exclude both venv and .venv from code quality checks.

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

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

app/exceptions/order.py

@@ -4,11 +4,9 @@ Order management specific exceptions.
 """
 
 from typing import Optional
-from .base import (
-    ResourceNotFoundException,
-    ValidationException,
-    BusinessLogicException
-)
+
+from .base import (BusinessLogicException, ResourceNotFoundException,
+                   ValidationException)
 
 
 class OrderNotFoundException(ResourceNotFoundException):
@@ -19,7 +17,7 @@ class OrderNotFoundException(ResourceNotFoundException):
             resource_type="Order",
             identifier=order_identifier,
             message=f"Order '{order_identifier}' not found",
-            error_code="ORDER_NOT_FOUND"
+            error_code="ORDER_NOT_FOUND",
         )
 
 
@@ -30,7 +28,7 @@ class OrderAlreadyExistsException(ValidationException):
         super().__init__(
             message=f"Order with number '{order_number}' already exists",
             error_code="ORDER_ALREADY_EXISTS",
-            details={"order_number": order_number}
+            details={"order_number": order_number},
         )
 
 
@@ -39,9 +37,7 @@ class OrderValidationException(ValidationException):
 
     def __init__(self, message: str, details: Optional[dict] = None):
         super().__init__(
-            message=message,
-            error_code="ORDER_VALIDATION_FAILED",
-            details=details
+            message=message, error_code="ORDER_VALIDATION_FAILED", details=details
         )
 
 
@@ -52,10 +48,7 @@ class InvalidOrderStatusException(BusinessLogicException):
         super().__init__(
             message=f"Cannot change order status from '{current_status}' to '{new_status}'",
             error_code="INVALID_ORDER_STATUS_CHANGE",
-            details={
-                "current_status": current_status,
-                "new_status": new_status
-            }
+            details={"current_status": current_status, "new_status": new_status},
         )
 
 
@@ -66,8 +59,5 @@ class OrderCannotBeCancelledException(BusinessLogicException):
         super().__init__(
             message=f"Order '{order_number}' cannot be cancelled: {reason}",
             error_code="ORDER_CANNOT_BE_CANCELLED",
-            details={
-                "order_number": order_number,
-                "reason": reason
-            }
+            details={"order_number": order_number, "reason": reason},
         )