feat: 添加IPv6地址获取功能，优化Cloudflare DNS记录更新逻辑，更新版本号并添加README

agent/ip.ts

@@ -8,6 +8,14 @@ const baseURLv6 = 'https://6.ipw.cn/';
 // https://api.ipify.org/?format=text
 // https://ipinfo.io/ip
 import { app } from './app.ts';
+import { exec } from 'child_process';
+import { promisify } from 'util';
+const execAsync = promisify(exec);
+
+const curl6 = async (url: string): Promise<string> => {
+  const { stdout } = await execAsync(`curl -6 -s "${url}"`);
+  return stdout.trim();
+};
 
 app.route({
   path: 'ip',
@@ -29,15 +37,11 @@ app.route({
 }).define(async (ctx) => {
   let ip = ''
   try {
-    const response = await fetch(baseURLv6);
-    ip = (await response.text()).trim();
-  } catch (error) {
-
-  }
+    ip = await curl6(baseURLv6);
+  } catch (error) { }
   if (!isIpv6(ip)) {
     try {
-      const response2 = await fetch('https://ifconfig.co/ip');
-      ip = (await response2.text()).trim();
+      ip = await curl6('https://ifconfig.co/ip');
       console.log('尝试第二个接口获取IPv6地址:', ip);
     } catch (error) { }
   }