fix: update import paths and enhance error handling in IP fetching

agent/ip.ts

@@ -1,6 +1,12 @@
 const baseURLv4 = 'https://4.ipw.cn/';
 const baseURLv6 = 'https://6.ipw.cn/';
+// ipv6
+// curl -6 ifconfig.co
+// curl -6 icanhazip.com
 
+// ipv4
+// https://api.ipify.org/?format=text
+// https://ipinfo.io/ip
 import { app } from './app.ts';
 
 app.route({
@@ -21,8 +27,20 @@ app.route({
   key: 'v6',
   description: '获取当前公网IPv6地址',
 }).define(async (ctx) => {
-  const response = await fetch(baseURLv6);
-  const ip = (await response.text()).trim();
+  let ip = ''
+  try {
+    const response = await fetch(baseURLv6);
+    ip = (await response.text()).trim();
+  } catch (error) {
+
+  }
+  if (!isIpv6(ip)) {
+    try {
+      const response2 = await fetch('https://ifconfig.co/ip');
+      ip = (await response2.text()).trim();
+      console.log('尝试第二个接口获取IPv6地址:', ip);
+    } catch (error) { }
+  }
   if (!isIpv6(ip)) {
     ctx.throw?.('获取地址失败');
   }