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/services/admin_audit_service.py

@@ -9,10 +9,9 @@ This module provides functions for:
 """
 
 import logging
-from datetime import datetime, timezone
-from typing import Any, Dict, List, Optional
+from typing import Any
 
-from sqlalchemy import and_, or_
+from sqlalchemy import and_
 from sqlalchemy.orm import Session
 
 from app.exceptions import AdminOperationException
@@ -33,10 +32,10 @@ class AdminAuditService:
         action: str,
         target_type: str,
         target_id: str,
-        details: Optional[Dict[str, Any]] = None,
-        ip_address: Optional[str] = None,
-        user_agent: Optional[str] = None,
-        request_id: Optional[str] = None,
+        details: dict[str, Any] | None = None,
+        ip_address: str | None = None,
+        user_agent: str | None = None,
+        request_id: str | None = None,
     ) -> AdminAuditLog:
         """
         Log an admin action to the audit trail.
@@ -85,7 +84,7 @@ class AdminAuditService:
 
     def get_audit_logs(
         self, db: Session, filters: AdminAuditLogFilters
-    ) -> List[AdminAuditLogResponse]:
+    ) -> list[AdminAuditLogResponse]:
         """
         Get filtered admin audit logs with pagination.
 
@@ -187,14 +186,14 @@ class AdminAuditService:
 
     def get_recent_actions_by_admin(
         self, db: Session, admin_user_id: int, limit: int = 10
-    ) -> List[AdminAuditLogResponse]:
+    ) -> list[AdminAuditLogResponse]:
         """Get recent actions by a specific admin."""
         filters = AdminAuditLogFilters(admin_user_id=admin_user_id, limit=limit)
         return self.get_audit_logs(db, filters)
 
     def get_actions_by_target(
         self, db: Session, target_type: str, target_id: str, limit: int = 50
-    ) -> List[AdminAuditLogResponse]:
+    ) -> list[AdminAuditLogResponse]:
         """Get all actions performed on a specific target."""
         try:
             logs = (