docs: add comprehensive tables of contents to all README files

- Add a detailed table of contents to all three README files in English, Simplified Chinese, and Traditional Chinese for easier navigation.

Signed-off-by: appleboy <appleboy.tw@gmail.com>

README.md

@@ -2,6 +2,37 @@
 
 English | [繁體中文](./README.zh-tw.md) | [简体中文](./README.zh-cn.md)
 
+## Table of Contents
+
+- [🚀 SSH for GitHub Actions](#-ssh-for-github-actions)
+  - [Table of Contents](#table-of-contents)
+  - [📖 Introduction](#-introduction)
+  - [🧩 Core Concepts \& Input Parameters](#-core-concepts--input-parameters)
+  - [⚡ Quick Start](#-quick-start)
+  - [🔑 SSH Key Setup \& OpenSSH Compatibility](#-ssh-key-setup--openssh-compatibility)
+    - [Setting Up SSH Keys](#setting-up-ssh-keys)
+      - [Generate RSA key](#generate-rsa-key)
+      - [Generate ED25519 key](#generate-ed25519-key)
+    - [OpenSSH Compatibility](#openssh-compatibility)
+  - [🛠️ Usage Scenarios \& Advanced Examples](#️-usage-scenarios--advanced-examples)
+    - [Using password authentication](#using-password-authentication)
+    - [Using private key authentication](#using-private-key-authentication)
+    - [Multiple commands](#multiple-commands)
+    - [Run commands from a file](#run-commands-from-a-file)
+    - [Multiple hosts](#multiple-hosts)
+    - [Multiple hosts with different ports](#multiple-hosts-with-different-ports)
+    - [Synchronous execution on multiple hosts](#synchronous-execution-on-multiple-hosts)
+    - [Pass environment variables to shell script](#pass-environment-variables-to-shell-script)
+  - [🌐 Proxy \& Jump Host Usage](#-proxy--jump-host-usage)
+  - [🛡️ Security Best Practices](#️-security-best-practices)
+    - [Protecting Your Private Key](#protecting-your-private-key)
+    - [Host Fingerprint Verification](#host-fingerprint-verification)
+  - [🚨 Error Handling \& Troubleshooting](#-error-handling--troubleshooting)
+    - [Q\&A](#qa)
+      - [Command not found (npm or other command)](#command-not-found-npm-or-other-command)
+  - [🤝 Contributing](#-contributing)
+  - [📝 License](#-license)
+
 ---
 
 ## 📖 Introduction