Initial WhaleTown V2 backend

src/app.service.ts

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+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { AppStatusResponseDto } from './business/shared';
+
+/**
+ * 应用服务类
+ *
+ * 功能描述：
+ * - 提供应用基础服务
+ * - 返回应用运行状态信息
+ *
+ * @author angjustinl
+ * @version 1.0.0
+ * @since 2025-12-17
+ */
+@Injectable()
+export class AppService {
+  private readonly startTime: number;
+
+  constructor(private readonly configService: ConfigService) {
+    this.startTime = Date.now();
+  }
+
+  /**
+   * 获取应用状态
+   *
+   * @returns 应用状态信息
+   */
+  getStatus(): AppStatusResponseDto {
+    const isDatabaseConfigured = this.isDatabaseConfigured();
+
+    return {
+      service: 'Pixel Game Server',
+      version: '1.1.1',
+      status: 'running',
+      timestamp: new Date().toISOString(),
+      uptime: Math.floor((Date.now() - this.startTime) / 1000),
+      environment: this.configService.get<string>('NODE_ENV', 'development'),
+      storageMode: isDatabaseConfigured ? 'database' : 'memory'
+    };
+  }
+
+  /**
+   * 检查数据库配置是否完整
+   *
+   * @returns 是否配置了数据库
+   */
+  private isDatabaseConfigured(): boolean {
+    const requiredEnvVars = ['DB_HOST', 'DB_PORT', 'DB_USERNAME', 'DB_PASSWORD', 'DB_NAME'];
+    return requiredEnvVars.every(varName => this.configService.get<string>(varName));
+  }
+}