refactor: modernize code quality tooling with Ruff

- Replace black, isort, and flake8 with Ruff (all-in-one linter and formatter)
- Add comprehensive pyproject.toml configuration
- Simplify Makefile code quality targets
- Configure exclusions for venv/.venv in pyproject.toml
- Auto-fix 1,359 linting issues across codebase

Benefits:
- Much faster builds (Ruff is written in Rust)
- Single tool replaces multiple tools
- More comprehensive rule set (UP, B, C4, SIM, PIE, RET, Q)
- All configuration centralized in pyproject.toml
- Better import sorting and formatting consistency

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

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

app/exceptions/order.py

@@ -3,10 +3,8 @@
 Order management specific exceptions.
 """
 
-from typing import Optional
 
-from .base import (BusinessLogicException, ResourceNotFoundException,
-                   ValidationException)
+from .base import BusinessLogicException, ResourceNotFoundException, ValidationException
 
 
 class OrderNotFoundException(ResourceNotFoundException):
@@ -35,7 +33,7 @@ class OrderAlreadyExistsException(ValidationException):
 class OrderValidationException(ValidationException):
     """Raised when order data validation fails."""
 
-    def __init__(self, message: str, details: Optional[dict] = None):
+    def __init__(self, message: str, details: dict | None = None):
         super().__init__(
             message=message, error_code="ORDER_VALIDATION_FAILED", details=details
         )