feat: Initialize NestJS backend project with Prisma, core modules, configuration, and common utilities.

src/app.service.ts

@@ -0,0 +1,38 @@
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { PrismaService } from './prisma';
+
+@Injectable()
+export class AppService {
+  constructor(
+    private readonly configService: ConfigService,
+    private readonly prisma: PrismaService,
+  ) {}
+
+  getHello(): string {
+    return 'Real Estate Agent Platform API v1.0';
+  }
+
+  async getHealth() {
+    const dbHealthy = await this.checkDatabaseHealth();
+
+    return {
+      status: 'ok',
+      timestamp: new Date().toISOString(),
+      environment: this.configService.get<string>('app.env'),
+      version: '1.0.0',
+      services: {
+        database: dbHealthy ? 'healthy' : 'unhealthy',
+      },
+    };
+  }
+
+  private async checkDatabaseHealth(): Promise<boolean> {
+    try {
+      await this.prisma.$queryRaw`SELECT 1`;
+      return true;
+    } catch {
+      return false;
+    }
+  }
+}