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/routes/cloudflare.ts

@@ -44,6 +44,24 @@ app.route({
 
   const cf = new CloudflareDDNS();
 
+  // 先搜索是否已存在相同 domain 和 type 的记录
+  const searchRes = await cf.getList(zone_id, api_token, { search: domain });
+  if (searchRes.success && searchRes.result && searchRes.result.length > 0) {
+    const existingRecord = searchRes.result.find((r: any) => r.name === domain && r.type === type);
+    if (existingRecord) {
+      console.log(`记录已存在: ${domain} (${type}) -> ${existingRecord.content}`);
+      ctx.body = {
+        record_id: existingRecord.id,
+        name: existingRecord.name,
+        content: existingRecord.content,
+        result: existingRecord,
+        existed: true,
+      };
+      return;
+    }
+  }
+
+  // 不存在则创建新记录
   const result = await cf.createRecord({
     zone_id,
     domain,
@@ -52,7 +70,7 @@ app.route({
     type,
   });
   if (result.success === false) {
-    ctx.throw?.(result.errors?.map((e) => e.message).join('; ') || '创建DNS记录失败');
+    ctx.throw?.(result.errors?.map((e: any) => e.message).join('; ') || '创建DNS记录失败');
   }
   console.log(`创建成功: ${domain} -> ${new_ip}`);
   const record_id = result.result.id;
@@ -63,7 +81,8 @@ app.route({
     record_id: record_id,
     name: name,
     content: content,
-    result: result.result
+    result: result.result,
+    existed: false,
   };
 }).addTo(app);