docs: update npm upgrade examples to stable 1.5.6

README.md

@@ -370,6 +370,8 @@ STT supports two-level configuration with priority fallback:
 
 ### Option 1: Upgrade via npm (Recommended)
 
+Current latest npm version: `1.5.6`
+
 ```bash
 bash ./scripts/npm-upgrade.sh
 ```
@@ -377,11 +379,8 @@ bash ./scripts/npm-upgrade.sh
 The script automatically backs up channel config → uninstalls old plugins → installs new version → restores config → restarts gateway.
 
 ```bash
-# Specify tag
-bash ./scripts/npm-upgrade.sh --tag alpha
-
 # Specify exact version
-bash ./scripts/npm-upgrade.sh --version 1.0.0-alpha.0
+bash ./scripts/npm-upgrade.sh --version 1.5.6
 ```
 
 ### Option 2: Upgrade via Source

README.zh.md

@@ -367,6 +367,8 @@ STT 支持两级配置，按优先级查找：
 
 ### 方式一：通过 npm 升级（推荐）
 
+当前最新 npm 版本：`1.5.6`
+
 ```bash
 bash ./scripts/npm-upgrade.sh
 ```
@@ -374,11 +376,8 @@ bash ./scripts/npm-upgrade.sh
 脚本会自动备份通道配置 → 卸载旧插件 → 安装新版本 → 恢复配置 → 重启网关。
 
 ```bash
-# 指定 tag
-bash ./scripts/npm-upgrade.sh --tag alpha
-
 # 指定版本号
-bash ./scripts/npm-upgrade.sh --version 1.0.0-alpha.0
+bash ./scripts/npm-upgrade.sh --version 1.5.6
 ```
 
 ### 方式二：通过源码升级