feat: Docker部署 + 云主机导入 + 终端优化

Docker 部署:
- 新增根目录 docker-compose.yml（MySQL+Redis+前后端四容器）
- 新增 frontend/Dockerfile（多阶段构建）和 nginx.conf（SPA+API反代）
- 修复 backend/Dockerfile：GOPROXY国内加速、编译整个cmd包

云主机导入功能:
- 新增 backend/internal/cloud 包：Provider接口 + 阿里云API客户端
- 新增 cloud_sync.go：区域同步/主机发现/导入 API
- 重写 CloudServerImport.tsx：4步流程（选云→选账号→选区域→发现导入）
- 修复导入外键约束失败（region_id/cloud_id 设为 NULL）

终端优化:
- 修复双X关闭按钮重影（showCloseButton=false）
- 修复最大化→最小化不恢复（ResizeObserver + 禁用CSS过渡）

其他:
- GORM AutoMigrate 逐表迁移，避免索引冲突阻塞启动
- Makefile 更新为 AIOps + 新增 docker 命令组
- .env.example 移至 backend 目录

docker-compose.yml

@@ -0,0 +1,100 @@
+version: '3.8'
+
+services:
+  # ======================== MySQL 数据库 ========================
+  mysql:
+    image: mysql:8.0
+    container_name: aiops-mysql
+    restart: unless-stopped
+    environment:
+      MYSQL_ROOT_PASSWORD: rootpassword
+      MYSQL_DATABASE: aiops
+      MYSQL_USER: aiops
+      MYSQL_PASSWORD: aiops123
+      TZ: Asia/Shanghai
+    ports:
+      - "3306:3306"
+    volumes:
+      - mysql_data:/var/lib/mysql
+    command: >
+      --default-authentication-plugin=mysql_native_password
+      --character-set-server=utf8mb4
+      --collation-server=utf8mb4_unicode_ci
+    healthcheck:
+      test: ["CMD", "mysqladmin", "ping", "-h", "localhost", "-uroot", "-p$$MYSQL_ROOT_PASSWORD"]
+      interval: 10s
+      timeout: 5s
+      retries: 10
+      start_period: 30s
+    networks:
+      - aiops-network
+
+  # ======================== Redis 缓存 ========================
+  redis:
+    image: redis:7-alpine
+    container_name: aiops-redis
+    restart: unless-stopped
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis_data:/data
+    command: redis-server --appendonly yes
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    networks:
+      - aiops-network
+
+  # ======================== Go 后端服务 ========================
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    container_name: aiops-backend
+    restart: unless-stopped
+    ports:
+      - "8080:8080"
+    volumes:
+      - ./backend/config.yaml:/app/config.yaml
+      - backend_logs:/app/logs
+      - backend_uploads:/app/uploads
+    depends_on:
+      mysql:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8080/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+    networks:
+      - aiops-network
+
+  # ======================== React 前端 + Nginx ========================
+  frontend:
+    build:
+      context: ./frontend
+      dockerfile: Dockerfile
+    container_name: aiops-frontend
+    restart: unless-stopped
+    ports:
+      - "80:80"
+    depends_on:
+      backend:
+        condition: service_healthy
+    networks:
+      - aiops-network
+
+volumes:
+  mysql_data:
+  redis_data:
+  backend_logs:
+  backend_uploads:
+
+networks:
+  aiops-network:
+    driver: bridge