Sửa lỗi frontend không kết nối với backend

backend/prisma/prisma.service.ts

@@ -2,10 +2,20 @@ import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
 import { PrismaClient } from '@prisma/client';
 import { PrismaPg } from '@prisma/adapter-pg';
 import { Pool } from 'pg';
+import * as dotenv from 'dotenv';
+import * as path from 'path';
+
+dotenv.config({ path: path.join(__dirname, '..', '.env') });
 
 @Injectable()
 export class PrismaService extends PrismaClient implements OnModuleInit, OnModuleDestroy {
   constructor() {
+    if (!process.env.DATABASE_URL) {
+      dotenv.config({ path: path.join(__dirname, '..', '..', '.env') });
+    }
+    console.log('--- [PRISMA CHECK] ---');
+    console.log('DATABASE_URL nhận được:', process.env.DATABASE_URL ? 'ĐÃ ĐỌC THÀNH CÔNG ✔️' : 'VẪN BỊ UNDEFINED ❌');
+    console.log('----------------------');
     const pool = new Pool({ connectionString: process.env.DATABASE_URL });
     const adapter = new PrismaPg(pool);
     super({ adapter });