添加复制和下载按钮，统计字数功能

Dockerfile

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+# 极简静态资源镜像
+FROM nginx:alpine
+
+# 安装 wget 用于健康检查
+RUN apk add --no-cache wget
+
+# 极简静态资源镜像
+FROM nginx:alpine
+
+# 安装 wget 用于健康检查
+RUN apk add --no-cache wget
+
+# 创建自定义 nginx 配置，禁用缓存并确保正确读取挂载目录
+RUN printf 'server {\n\
+    listen 80;\n\
+    server_name localhost;\n\
+    root /usr/share/nginx/html;\n\
+    index index.html index.htm;\n\
+    \n\
+    # 禁用缓存\n\
+    add_header Cache-Control "no-cache, no-store, must-revalidate";\n\
+    add_header Pragma "no-cache";\n\
+    add_header Expires "0";\n\
+    \n\
+    location / {\n\
+        try_files $uri $uri/ /index.html;\n\
+        # 确保每次都读取最新文件\n\
+        sendfile off;\n\
+        tcp_nodelay on;\n\
+        tcp_nopush off;\n\
+    }\n\
+    \n\
+    # 禁用所有静态文件缓存\n\
+    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg)$ {\n\
+        add_header Cache-Control "no-cache, no-store, must-revalidate";\n\
+        add_header Pragma "no-cache";\n\
+        add_header Expires "0";\n\
+    }\n\
+}\n' > /etc/nginx/conf.d/default.conf
+
+# 确保挂载目录存在但为空（避免与外部挂载冲突）
+RUN mkdir -p /usr/share/nginx/html && \
+    rm -rf /usr/share/nginx/html/* && \
+    echo "Waiting for external mount..." > /usr/share/nginx/html/.placeholder
+
+# 暴露静态服务端口
+EXPOSE 80
+
+# 启动 nginx 前台运行
+CMD ["nginx", "-g", "daemon off;"]