fix(modules): 修正 zsh hook 脚本路径

modules/zsh/set-default-shell.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -euo pipefail
+
+if [ "$SHELL" != "$(which zsh)" ]; then
+    echo "==> 设置默认 shell 为 zsh..."
+    sudo chsh -s "$(which zsh)" "$USER"
+    echo "✓ 默认 shell 已设置为 zsh（重新登录后生效）"
+else
+    echo "默认 shell 已经是 zsh"
+fi