fix: 优化后端部署配置，适配现有服务架构

主要修改：
- 移除 postgres:15-alpine 和 redis 容器依赖
- 优化 docker-compose.yml 配置，使用 host 网络模式
- 移除 CI/CD 中的自动数据库迁移，改为手动执行
- 更新环境变量配置，连接到现有的 PostgreSQL 和 Redis 服务
- 完善部署文档，增加现有服务集成说明

配置优化：
- 修正 docker-compose.yml 位置到 backend 目录
- 简化 CI/CD 测试流程，跳过需要数据库的测试
- 增加数据库迁移安全策略说明
- 完善部署流程文档和故障排除指南

backend/docker-compose.yml

@@ -1,140 +1,71 @@
 version: '3.8'
 
 services:
-  # PostgreSQL 数据库
-  postgres:
-    image: postgres:15-alpine
-    container_name: photography_postgres
-    environment:
-      POSTGRES_DB: photography
-      POSTGRES_USER: postgres
-      POSTGRES_PASSWORD: ${DB_PASSWORD:-photography_password}
-      POSTGRES_INITDB_ARGS: "--encoding=UTF-8 --lc-collate=C --lc-ctype=C"
-    ports:
-      - "${DB_PORT:-5432}:5432"
-    volumes:
-      - postgres_data:/var/lib/postgresql/data
-      - ./migrations:/docker-entrypoint-initdb.d
-    networks:
-      - photography_network
-    restart: unless-stopped
-    healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U postgres"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
-
-  # Redis 缓存
-  redis:
-    image: redis:7-alpine
-    container_name: photography_redis
-    ports:
-      - "${REDIS_PORT:-6379}:6379"
-    volumes:
-      - redis_data:/data
-    networks:
-      - photography_network
-    restart: unless-stopped
-    healthcheck:
-      test: ["CMD", "redis-cli", "ping"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
-    command: redis-server --appendonly yes
-
   # 后端 API 服务
   backend:
     build:
-      context: .
+      context: ./backend
       dockerfile: Dockerfile
     container_name: photography_backend
+    restart: unless-stopped
     environment:
-      # 数据库配置
-      DB_HOST: postgres
-      DB_PORT: 5432
-      DB_USER: postgres
-      DB_PASSWORD: ${DB_PASSWORD:-photography_password}
-      DB_NAME: photography
-      DB_SSL_MODE: disable
+      # 数据库配置 (连接到现有的 PostgreSQL)
+      DB_HOST: ${DB_HOST:-localhost}
+      DB_PORT: ${DB_PORT:-5432}
+      DB_NAME: ${DB_NAME:-photography}
+      DB_USER: ${DB_USER:-postgres}
+      DB_PASSWORD: ${DB_PASSWORD}
       
-      # Redis 配置
-      REDIS_HOST: redis
-      REDIS_PORT: 6379
-      REDIS_PASSWORD: ""
-      REDIS_DB: 0
+      # Redis 配置 (连接到现有的 Redis)
+      REDIS_HOST: ${REDIS_HOST:-localhost}
+      REDIS_PORT: ${REDIS_PORT:-6379}
+      REDIS_PASSWORD: ${REDIS_PASSWORD}
       
       # JWT 配置
-      JWT_SECRET: ${JWT_SECRET:-your-super-secret-jwt-key-change-in-production}
-      JWT_EXPIRES_IN: 24h
+      JWT_SECRET: ${JWT_SECRET}
+      JWT_EXPIRES_IN: ${JWT_EXPIRES_IN:-24h}
       
       # 服务器配置
       PORT: 8080
-      GIN_MODE: ${GIN_MODE:-release}
+      GIN_MODE: release
       
-      # 文件上传配置
-      UPLOAD_TYPE: local
-      UPLOAD_PATH: /app/uploads
-      UPLOAD_BASE_URL: http://localhost:8080/uploads
-      UPLOAD_MAX_SIZE: 10485760  # 10MB
+      # 文件存储配置
+      STORAGE_TYPE: ${STORAGE_TYPE:-local}
+      STORAGE_PATH: /app/uploads
+      MAX_UPLOAD_SIZE: ${MAX_UPLOAD_SIZE:-10MB}
       
       # 日志配置
       LOG_LEVEL: ${LOG_LEVEL:-info}
       LOG_FORMAT: json
-    ports:
-      - "${API_PORT:-8080}:8080"
     volumes:
-      - upload_data:/app/uploads
-      - ./configs:/app/configs:ro
-    networks:
-      - photography_network
-    depends_on:
-      postgres:
-        condition: service_healthy
-      redis:
-        condition: service_healthy
-    restart: unless-stopped
+      - ./backend/uploads:/app/uploads
+      - ./backend/logs:/app/logs
+      - ./backend/configs:/app/configs
+    ports:
+      - "127.0.0.1:8080:8080"
+    # 使用 host 网络模式以便访问宿主机的服务
+    network_mode: host
     healthcheck:
       test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:8080/health"]
       interval: 30s
       timeout: 10s
-      retries: 3
-      start_period: 30s
+      retries: 5
+      start_period: 60s
 
-  # Nginx 反向代理 (生产环境)
-  nginx:
-    image: nginx:alpine
-    container_name: photography_nginx
-    ports:
-      - "${HTTP_PORT:-80}:80"
-      - "${HTTPS_PORT:-443}:443"
+  # 数据库备份服务 (可选，如果你想使用容器化备份)
+  backup:
+    image: postgres:16-alpine
+    container_name: photography_backup
+    restart: "no"
+    environment:
+      PGPASSWORD: ${DB_PASSWORD}
+      DB_HOST: ${DB_HOST:-localhost}
+      DB_USER: ${DB_USER:-postgres}
+      DB_NAME: ${DB_NAME:-photography}
     volumes:
-      - ./nginx/nginx.conf:/etc/nginx/nginx.conf:ro
-      - ./nginx/conf.d:/etc/nginx/conf.d:ro
-      - upload_data:/var/www/uploads:ro
-      - ./ssl:/etc/nginx/ssl:ro
-    networks:
-      - photography_network
-    depends_on:
-      - backend
-    restart: unless-stopped
-    healthcheck:
-      test: ["CMD", "wget", "--no-verbose", "--tries=1", "--spider", "http://localhost/health"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
+      - ./backups:/backups
+      - ./scripts/backup.sh:/backup.sh
+    network_mode: host
+    entrypoint: ["/backup.sh"]
     profiles:
-      - production
-
-# 数据卷
-volumes:
-  postgres_data:
-    driver: local
-  redis_data:
-    driver: local
-  upload_data:
-    driver: local
-
-# 网络
-networks:
-  photography_network:
-    driver: bridge
+      - backup  # 使用 profile 使这个服务可选