Add DevOps release and deployment configuration

Co-authored-by: Cursor <cursoragent@cursor.com>

deploy/nginx/Dockerfile

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+# Nginx 镜像 Dockerfile
+# 用途：构建包含自定义配置的 Nginx 镜像
+
+FROM nginx:alpine
+
+# 复制 Nginx 配置
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+# 暴露端口
+EXPOSE 80 443
+
+# 启动 Nginx
+CMD ["nginx", "-g", "daemon off;"]

deploy/nginx/nginx.conf

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+server {
+    listen 80;
+    server_name _;
+
+    # 后端 API
+    location /api/ {
+        proxy_pass http://backend:8000/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # 超时设置
+        proxy_connect_timeout 60s;
+        proxy_send_timeout 60s;
+        proxy_read_timeout 60s;
+    }
+
+    # 管理后台
+    location / {
+        proxy_pass http://admin:3000/;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        
+        # WebSocket 支持（如果需要）
+        proxy_http_version 1.1;
+        proxy_set_header Upgrade $http_upgrade;
+        proxy_set_header Connection "upgrade";
+    }
+
+    # 健康检查
+    location /health {
+        access_log off;
+        return 200 "healthy\n";
+        add_header Content-Type text/plain;
+    }
+}