feat: 重构多语言模块，符合NestJS规范

- 重构LanguageUtils为LanguageService，实现ILanguageService接口
- 移除自定义验证管道和装饰器，使用标准NestJS验证
- 集成框架ValidatorService进行业务验证
- 简化目录结构，移除不必要的子目录
- 支持模块化语言包加载（common、user、order等）
- 统一API响应格式（code、msg、data、timestamp）
- 添加ValidationExceptionFilter处理多语言验证错误
- 完善多语言示例和文档

start-dev.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+echo "╔════════════════════════════════════════════════════════════════════════════╗"
+echo "║              🚀 启动开发环境（MySQL + Redis + 本地服务）                     ║"
+echo "╚════════════════════════════════════════════════════════════════════════════╝"
+echo ""
+
+# 步骤1: 启动MySQL和Redis
+echo "📦 步骤1: 启动MySQL和Redis容器..."
+docker-compose -f docker-compose.dev.yml up -d
+
+# 等待服务就绪
+echo "⏳ 等待MySQL和Redis就绪..."
+sleep 10
+
+# 检查服务状态
+echo ""
+echo "📊 服务状态:"
+docker-compose -f docker-compose.dev.yml ps
+
+echo ""
+echo "✅ MySQL和Redis已启动！"
+echo ""
+echo "🔗 连接信息:"
+echo "   MySQL: localhost:3306"
+echo "   Redis: localhost:6379"
+echo ""
+echo "📋 下一步:"
+echo "   1. 启动NestJS: cd wwjcloud-nest && npm run start:dev"
+echo "   2. 启动Admin:  cd wwjcloud-nest/admin && npm run dev"
+echo ""