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

docker-compose.dev.yml

@@ -0,0 +1,66 @@
+version: '3.8'
+
+# 开发环境的Docker Compose配置
+# 使用方式: docker-compose -f docker-compose.dev.yml up
+
+services:
+  # ========================================
+  # MySQL 数据库（开发）
+  # ========================================
+  mysql:
+    image: mysql:8.0
+    container_name: wwjcloud-mysql-dev
+    restart: unless-stopped
+    environment:
+      MYSQL_ROOT_PASSWORD: root123456
+      MYSQL_DATABASE: wwjcloud
+      MYSQL_USER: wwjcloud
+      MYSQL_PASSWORD: wwjcloud123
+      TZ: Asia/Shanghai
+    ports:
+      - "3306:3306"
+    volumes:
+      - mysql_dev_data:/var/lib/mysql
+      - ./sql:/docker-entrypoint-initdb.d
+    command: 
+      - --character-set-server=utf8mb4
+      - --collation-server=utf8mb4_unicode_ci
+      - --default-authentication-plugin=mysql_native_password
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-u", "root", "-proot123456"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    networks:
+      - wwjcloud-dev-network
+
+  # ========================================
+  # Redis 缓存（开发）
+  # ========================================
+  redis:
+    image: redis:7-alpine
+    container_name: wwjcloud-redis-dev
+    restart: unless-stopped
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis_dev_data:/data
+    command: redis-server --appendonly yes --requirepass redis123456
+    healthcheck:
+      test: ["CMD", "redis-cli", "-a", "redis123456", "ping"]
+      interval: 10s
+      timeout: 3s
+      retries: 5
+    networks:
+      - wwjcloud-dev-network
+
+volumes:
+  mysql_dev_data:
+    driver: local
+  redis_dev_data:
+    driver: local
+
+networks:
+  wwjcloud-dev-network:
+    driver: bridge
+