feat: 完成部署和运维系统完善

- 完善后端CI/CD部署流程，支持systemd服务管理
- 配置Caddy多域名反向代理 (前端/API/管理后台)
- 创建完整的生产环境监控系统
- 添加自动化运维脚本和定时监控
- 优化安全配置和错误处理机制
- 标准化备份、回滚、健康检查流程

🎯 里程碑: 部署和运维体系完善，生产环境就绪
📊 进度: 65.0% (26/40任务完成)

docs/deployment/Caddyfile

@@ -1,6 +1,7 @@
 # Photography Portfolio Caddyfile
-# 将 https://photography.iriver.top 映射到用户目录
+# 前端展示网站和后端API反向代理配置
 
+# 前端展示网站
 photography.iriver.top {
     # 静态文件服务
     root * /home/gitea/www/photography
@@ -57,4 +58,150 @@ photography.iriver.top {
         rewrite @404 /404.html
         file_server
     }
+}
+
+# 后端API反向代理
+api.photography.iriver.top {
+    # 反向代理到后端服务
+    reverse_proxy localhost:8080 {
+        # 健康检查
+        health_uri /health
+        health_interval 30s
+        health_timeout 5s
+        health_status 200
+        
+        # 故障转移
+        fail_duration 30s
+        max_fails 3
+        unhealthy_status 5xx
+        
+        # 请求头设置
+        header_up Host {upstream_hostport}
+        header_up X-Real-IP {remote_host}
+        header_up X-Forwarded-For {remote_host}
+        header_up X-Forwarded-Proto {scheme}
+        header_up X-Forwarded-Host {host}
+        
+        # 响应头设置
+        header_down -Server
+        header_down Access-Control-Allow-Origin "*"
+        header_down Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS"
+        header_down Access-Control-Allow-Headers "Content-Type, Authorization"
+    }
+    
+    # 启用 gzip 压缩
+    encode gzip
+    
+    # 请求日志
+    log {
+        output file /var/log/caddy/api.photography.log {
+            roll_size 10MB
+            roll_keep 5
+        }
+        format json
+    }
+    
+    # 限流配置
+    rate_limit {
+        zone dynamic {
+            key {remote_host}
+            events 100
+            window 1m
+        }
+        zone static {
+            key {remote_host}
+            events 500
+            window 1m
+        }
+    }
+    
+    # 安全头设置
+    header {
+        # 防止点击劫持
+        X-Frame-Options "DENY"
+        # 防止 MIME 类型嗅探
+        X-Content-Type-Options "nosniff"
+        # XSS 保护
+        X-XSS-Protection "1; mode=block"
+        # 推荐 HTTPS
+        Strict-Transport-Security "max-age=31536000; includeSubDomains"
+        # 隐藏服务器信息
+        -Server
+    }
+    
+    # 错误处理
+    handle_errors {
+        @5xx {
+            expression {http.error.status_code} >= 500
+        }
+        respond @5xx `{"error": "服务器内部错误", "code": 500, "message": "API服务暂时不可用，请稍后重试"}` 500 {
+            header Content-Type "application/json"
+        }
+        
+        @4xx {
+            expression {http.error.status_code} >= 400
+        }
+        respond @4xx `{"error": "请求错误", "code": {http.error.status_code}, "message": "请求无效"}` {http.error.status_code} {
+            header Content-Type "application/json"
+        }
+    }
+}
+
+# 管理后台
+admin.photography.iriver.top {
+    # 静态文件服务
+    root * /home/gitea/www/photography-admin
+    
+    # 启用文件服务器
+    file_server
+    
+    # 启用 gzip 压缩
+    encode gzip
+    
+    # 设置默认首页
+    try_files {path} {path}/ /index.html
+    
+    # 设置静态资源缓存
+    @static {
+        path *.css *.js *.png *.jpg *.jpeg *.gif *.svg *.woff *.woff2 *.ttf *.eot *.ico
+    }
+    header @static Cache-Control "public, max-age=31536000, immutable"
+    
+    # 设置 HTML 文件缓存
+    @html {
+        path *.html
+    }
+    header @html Cache-Control "public, max-age=3600"
+    
+    # 安全头设置
+    header {
+        # 防止点击劫持
+        X-Frame-Options "SAMEORIGIN"
+        # 防止 MIME 类型嗅探
+        X-Content-Type-Options "nosniff"
+        # XSS 保护
+        X-XSS-Protection "1; mode=block"
+        # 推荐 HTTPS
+        Strict-Transport-Security "max-age=31536000; includeSubDomains"
+        # 隐藏服务器信息
+        -Server
+    }
+    
+    # 日志配置
+    log {
+        output file /var/log/caddy/admin.photography.log {
+            roll_size 10MB
+            roll_keep 5
+        }
+        format json
+    }
+    
+    # 错误页面处理
+    handle_errors {
+        @404 {
+            expression {http.error.status_code} == 404
+        }
+        rewrite @404 /index.html
+        file_server
+    }
 }