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/settings.py

@@ -9,7 +9,6 @@ Provides endpoints for:
 """
 
 import logging
-from typing import Optional
 
 from fastapi import APIRouter, Depends, Query
 from sqlalchemy.orm import Session
@@ -19,8 +18,12 @@ from app.core.database import get_db
 from app.services.admin_audit_service import admin_audit_service
 from app.services.admin_settings_service import admin_settings_service
 from models.database.user import User
-from models.schema.admin import (AdminSettingCreate, AdminSettingListResponse,
-                                 AdminSettingResponse, AdminSettingUpdate)
+from models.schema.admin import (
+    AdminSettingCreate,
+    AdminSettingListResponse,
+    AdminSettingResponse,
+    AdminSettingUpdate,
+)
 
 router = APIRouter(prefix="/settings")
 logger = logging.getLogger(__name__)
@@ -28,8 +31,8 @@ logger = logging.getLogger(__name__)
 
 @router.get("", response_model=AdminSettingListResponse)
 def get_all_settings(
-    category: Optional[str] = Query(None, description="Filter by category"),
-    is_public: Optional[bool] = Query(None, description="Filter by public flag"),
+    category: str | None = Query(None, description="Filter by category"),
+    is_public: bool | None = Query(None, description="Filter by public flag"),
     db: Session = Depends(get_db),
     current_admin: User = Depends(get_current_admin_api),
 ):