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/admin/vendor_domains.py

@@ -10,9 +10,8 @@ Follows the architecture pattern:
 """
 
 import logging
-from typing import List
 
-from fastapi import APIRouter, Body, Depends, Path, Query
+from fastapi import APIRouter, Body, Depends, Path
 from sqlalchemy.orm import Session
 
 from app.api.deps import get_current_admin_api
@@ -21,13 +20,15 @@ from app.exceptions import VendorNotFoundException
 from app.services.vendor_domain_service import vendor_domain_service
 from models.database.user import User
 from models.database.vendor import Vendor
-from models.schema.vendor_domain import (DomainDeletionResponse,
-                                         DomainVerificationInstructions,
-                                         DomainVerificationResponse,
-                                         VendorDomainCreate,
-                                         VendorDomainListResponse,
-                                         VendorDomainResponse,
-                                         VendorDomainUpdate)
+from models.schema.vendor_domain import (
+    DomainDeletionResponse,
+    DomainVerificationInstructions,
+    DomainVerificationResponse,
+    VendorDomainCreate,
+    VendorDomainListResponse,
+    VendorDomainResponse,
+    VendorDomainUpdate,
+)
 
 router = APIRouter(prefix="/vendors")
 logger = logging.getLogger(__name__)