complete new audit system

backend/src/middleware/auth.ts

@@ -1,10 +1,8 @@
 import { Response, NextFunction } from 'express';
 import jwt from 'jsonwebtoken';
-import { PrismaClient } from '@prisma/client';
+import prisma from '../lib/prisma.js';
 import { AuthRequest, JwtPayload } from '../types/index.js';
 
-const prisma = new PrismaClient();
-
 export async function authenticate(
   req: AuthRequest,
   res: Response,