添加更新脚本，修改README

README.md

@@ -58,6 +58,8 @@
 
 - [install.sh](./install.sh)
   Linux 安装脚本
+- [update.sh](./update.sh)
+  Linux 升级脚本
 - [option/xboard.go](./option/xboard.go)
   `services.xboard` 配置结构
 - [service/xboard/service.go](./service/xboard/service.go)
@@ -76,6 +78,13 @@ curl -fsSL https://s3.cloudyun.top/downloads/singbox/install.sh | bash
 ```
 `install.sh` 默认会从 `https://s3.cloudyun.top/downloads/singbox` 下载对应架构的预编译 `sing-box` 二进制，再继续进入面板和服务配置流程。
 
+升级已安装的 sing-box：
+
+```bash
+curl -fsSL https://s3.cloudyun.top/downloads/singbox/update.sh | bash
+```
+`update.sh` 会从同一发布地址下载对应架构的 `sing-box` 二进制，并自动重启已检测到的 `singbox` 或 `sing-box` 服务。
+
 
 脚本会做这些事情：
 

update.sh

@@ -0,0 +1,141 @@
+#!/bin/bash
+
+set -euo pipefail
+
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+BINARY_PATH="${BINARY_PATH:-/usr/local/bin/sing-box}"
+RELEASE_BASE_URL="${RELEASE_BASE_URL:-https://s3.cloudyun.top/downloads/singbox}"
+SERVICE_CANDIDATES=("${SERVICE_NAME:-}" "singbox" "sing-box")
+
+echo -e "${GREEN}sing-box binary update script${NC}"
+
+if [[ ${EUID} -ne 0 ]]; then
+    echo -e "${RED}This script must be run as root${NC}"
+    exit 1
+fi
+
+OS="$(uname -s)"
+if [[ "$OS" != "Linux" ]]; then
+    echo -e "${RED}This update script currently supports Linux only. Current OS: ${OS}${NC}"
+    exit 1
+fi
+
+ARCH="$(uname -m)"
+case "$ARCH" in
+    x86_64) BINARY_ARCH="amd64" ;;
+    aarch64|arm64) BINARY_ARCH="arm64" ;;
+    armv7l|armv7) BINARY_ARCH="armv7" ;;
+    *)
+        echo -e "${RED}Unsupported architecture: ${ARCH}${NC}"
+        exit 1
+        ;;
+esac
+
+DOWNLOAD_TARGET="${DOWNLOAD_TARGET:-linux-${BINARY_ARCH}}"
+DOWNLOAD_URL="${DOWNLOAD_URL:-${RELEASE_BASE_URL}/sing-box-${DOWNLOAD_TARGET}}"
+TMP_BINARY="$(mktemp)"
+BACKUP_BINARY="$(mktemp)"
+
+cleanup() {
+    rm -f "${TMP_BINARY}" "${BACKUP_BINARY}"
+}
+trap cleanup EXIT
+
+detect_service_name() {
+    local candidate
+    for candidate in "${SERVICE_CANDIDATES[@]}"; do
+        if [[ -z "${candidate}" ]]; then
+            continue
+        fi
+        if systemctl list-unit-files --type=service --no-legend 2>/dev/null | awk '{print $1}' | grep -Fxq "${candidate}.service"; then
+            printf '%s\n' "${candidate}"
+            return 0
+        fi
+    done
+    return 1
+}
+
+download_binary() {
+    echo -e "${YELLOW}Downloading sing-box binary...${NC}"
+    echo -e "${YELLOW}Target: ${DOWNLOAD_TARGET}${NC}"
+    echo -e "${YELLOW}URL: ${DOWNLOAD_URL}${NC}"
+
+    if command -v curl >/dev/null 2>&1; then
+        curl -fL "${DOWNLOAD_URL}" -o "${TMP_BINARY}"
+    elif command -v wget >/dev/null 2>&1; then
+        wget -O "${TMP_BINARY}" "${DOWNLOAD_URL}"
+    else
+        echo -e "${RED}Neither curl nor wget is installed.${NC}"
+        exit 1
+    fi
+
+    chmod 0755 "${TMP_BINARY}"
+}
+
+validate_binary() {
+    if ! "${TMP_BINARY}" version >/dev/null 2>&1; then
+        echo -e "${RED}Downloaded file is not a valid sing-box binary.${NC}"
+        exit 1
+    fi
+}
+
+current_version() {
+    if [[ -x "${BINARY_PATH}" ]]; then
+        "${BINARY_PATH}" version 2>/dev/null | head -n 1 || true
+    fi
+}
+
+new_version() {
+    "${TMP_BINARY}" version 2>/dev/null | head -n 1 || true
+}
+
+rollback() {
+    echo -e "${RED}Update failed, rolling back to previous binary...${NC}"
+    install -m 0755 "${BACKUP_BINARY}" "${BINARY_PATH}"
+    if [[ -n "${SERVICE_NAME_DETECTED:-}" ]]; then
+        systemctl restart "${SERVICE_NAME_DETECTED}" || true
+    fi
+}
+
+download_binary
+validate_binary
+
+OLD_VERSION="$(current_version)"
+NEW_VERSION="$(new_version)"
+
+if [[ -n "${OLD_VERSION}" ]]; then
+    echo -e "${YELLOW}Current version: ${OLD_VERSION}${NC}"
+else
+    echo -e "${YELLOW}Current version: not installed or unreadable${NC}"
+fi
+echo -e "${YELLOW}New version: ${NEW_VERSION}${NC}"
+
+if [[ -x "${BINARY_PATH}" ]]; then
+    cp -f "${BINARY_PATH}" "${BACKUP_BINARY}"
+else
+    : > "${BACKUP_BINARY}"
+fi
+
+install -m 0755 "${TMP_BINARY}" "${BINARY_PATH}"
+
+SERVICE_NAME_DETECTED="$(detect_service_name || true)"
+if [[ -n "${SERVICE_NAME_DETECTED}" ]]; then
+    echo -e "${YELLOW}Restarting service: ${SERVICE_NAME_DETECTED}${NC}"
+    if ! systemctl restart "${SERVICE_NAME_DETECTED}"; then
+        if [[ -s "${BACKUP_BINARY}" ]]; then
+            rollback
+        fi
+        exit 1
+    fi
+    echo -e "${GREEN}Service restarted successfully.${NC}"
+else
+    echo -e "${YELLOW}No systemd service detected. Binary updated only.${NC}"
+fi
+
+echo -e "${GREEN}sing-box has been updated successfully.${NC}"
+echo -e "${GREEN}Binary: ${BINARY_PATH}${NC}"
+echo -e "${GREEN}Version: $(current_version)${NC}"