Refactor Prisma client usage and enhance service integration for improved connection management

src/common/database/prisma.service.ts

@@ -1,8 +1,15 @@
 import { Injectable, OnModuleInit, OnModuleDestroy } from '@nestjs/common';
 import { PrismaClient } from '@prisma/client';
+import { prisma } from './prisma.client';
 
 @Injectable()
 export class PrismaService extends PrismaClient implements OnModuleInit, OnModuleDestroy {
+  constructor() {
+    super();
+    // Use the singleton instance
+    Object.assign(this, prisma);
+  }
+
   async onModuleInit() {
     await this.$connect();
   }