fix: 修复 #591 POC 对 HTTPS 端口误用 HTTP + #592 空指针 panic

1. buildTargetURL 对 443/8443 等已知 TLS 端口默认使用 https scheme，
   webtitle 触发 POC 扫描前将检测到的协议写回 info.URL，
   避免对 HTTPS 服务发送 HTTP 请求导致 EOF
2. GetInfo 添加 probe nil 检查，防止探针初始化失败时空指针 panic
3. 删除 test-nuclei-example.yaml 测试模板，避免 robots.txt 误报

webscan/web_scan.go

@@ -97,7 +97,11 @@ func WebScan(ctx context.Context, info *common.HostInfo, cfg *common.Config, ses
 func buildTargetURL(info *common.HostInfo) (string, error) {
 	// 自动构建URL
 	if info.URL == "" {
-		info.URL = protocolHTTP + net.JoinHostPort(info.Host, fmt.Sprint(info.Port))
+		protocol := protocolHTTP
+		if isTLSPort(info.Port) {
+			protocol = protocolHTTPS
+		}
+		info.URL = protocol + net.JoinHostPort(info.Host, fmt.Sprint(info.Port))
 	} else if !hasProtocolPrefix(info.URL) {
 		info.URL = protocolHTTP + normalizeSchemelessWebTarget(info.URL)
 	}
@@ -132,6 +136,15 @@ func hasProtocolPrefix(urlStr string) bool {
 	return strings.HasPrefix(urlStr, protocolHTTP) || strings.HasPrefix(urlStr, protocolHTTPS)
 }
 
+func isTLSPort(port int) bool {
+	switch port {
+	case 443, 8443, 4443, 9443:
+		return true
+	default:
+		return false
+	}
+}
+
 func normalizeSchemelessWebTarget(rawURL string) string {
 	authority := rawURL
 	suffix := ""