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/api/v1/vendor/orders.py

@@ -4,9 +4,8 @@ Vendor order management endpoints.
 """
 
 import logging
-from typing import Optional
 
-from fastapi import APIRouter, Depends, HTTPException, Query, Request
+from fastapi import APIRouter, Depends, Query
 from sqlalchemy.orm import Session
 
 from app.api.deps import get_current_vendor_api
@@ -14,9 +13,13 @@ from app.core.database import get_db
 from app.services.order_service import order_service
 from middleware.vendor_context import require_vendor_context
 from models.database.user import User
-from models.database.vendor import Vendor, VendorUser
-from models.schema.order import (OrderDetailResponse, OrderListResponse,
-                                 OrderResponse, OrderUpdate)
+from models.database.vendor import Vendor
+from models.schema.order import (
+    OrderDetailResponse,
+    OrderListResponse,
+    OrderResponse,
+    OrderUpdate,
+)
 
 router = APIRouter(prefix="/orders")
 logger = logging.getLogger(__name__)
@@ -26,8 +29,8 @@ logger = logging.getLogger(__name__)
 def get_vendor_orders(
     skip: int = Query(0, ge=0),
     limit: int = Query(100, ge=1, le=1000),
-    status: Optional[str] = Query(None, description="Filter by order status"),
-    customer_id: Optional[int] = Query(None, description="Filter by customer"),
+    status: str | None = Query(None, description="Filter by order status"),
+    customer_id: int | None = Query(None, description="Filter by customer"),
     vendor: Vendor = Depends(require_vendor_context()),
     current_user: User = Depends(get_current_vendor_api),
     db: Session = Depends(get_db),