fix: 修复 POC Cookie/变量提取的两个问题

- poc_adapter: xray/afrog 的 output.search 转换为 Search 字段，多步POC变量传递不再丢失
- poc_executor: Set-Cookie 提取优化不再要求捕获组名含 cookie，sessid/token等命名均生效

webscan/lib/poc_executor.go

@@ -348,8 +348,8 @@ func doSearch(re string, body string) map[string]string {
 		paramsMap := make(map[string]string)
 		for i, name := range names {
 			if i > 0 && i <= len(result) {
-				// 特殊处理Cookie头
-				if strings.HasPrefix(re, "Set-Cookie:") && strings.Contains(name, "cookie") {
+				// 特殊处理Set-Cookie头：剥离Path/Expires等属性，仅保留key=value
+				if strings.HasPrefix(re, "Set-Cookie:") {
 					paramsMap[name] = optimizeCookies(result[i])
 				} else {
 					paramsMap[name] = result[i]