feat: add zsh

zsh/.zshrc

@@ -0,0 +1,18 @@
+# Oh My Zsh（由 ~/.dotfile/script/zsh-init.sh 安装到 ~/.oh-my-zsh）
+export ZSH="$HOME/.oh-my-zsh"
+ZSH_THEME="robbyrussell"
+
+# z：目录跳转频率学习（OMZ 自带 plugins/z）
+plugins=(
+  git
+  z
+)
+
+if [[ -d "$ZSH" ]]; then
+  source "$ZSH/oh-my-zsh.sh"
+else
+  echo "[zsh] Oh My Zsh 未安装，请运行: bash ~/.dotfile/script/zsh-init.sh" >&2
+fi
+
+# 本机私有配置（不纳入 dotfile）
+[[ -f "$HOME/.zshrc.local" ]] && source "$HOME/.zshrc.local"