refactor: 全量替换 WrapperTcpWithTimeout 为 session.DialTCP (Phase 4)

- core/port_scan.go: EnhancedPortScan/connectWithRetry/scanSinglePort 接入 session
- core/service_probe.go: SmartPortInfoScanner 持有 session，重连走 session.DialTCP
- core/icmp.go: CheckLive/tcpProbeAlive 接入 session
- 17 个 service 插件: 内部 helper 函数全部穿透 ctx+session
- 移除插件中冗余的手动 TCP 计数（DialTCP 内部已处理）
- plugins/core 下已无 WrapperTcpWithTimeout/SafeTCPDial 调用残留

plugins/services/netbios.go

@@ -51,7 +51,7 @@ func (p *NetBIOSPlugin) Scan(ctx context.Context, info *common.HostInfo, session
 		netbiosInfo, err = p.queryNetBIOSNames(info.Host, config, state)
 	} else {
 		// TCP端口139 - NetBIOS会话服务
-		netbiosInfo, err = p.queryNetBIOSSession(info.Host, config)
+		netbiosInfo, err = p.queryNetBIOSSession(ctx, info.Host, session)
 	}
 
 	if err != nil {
@@ -186,16 +186,16 @@ func (p *NetBIOSPlugin) queryNetBIOSNames(host string, config *common.Config, st
 }
 
 // queryNetBIOSSession 查询NetBIOS会话服务(TCP 139)
-func (p *NetBIOSPlugin) queryNetBIOSSession(host string, config *common.Config) (*NetBIOSInfo, error) {
+func (p *NetBIOSPlugin) queryNetBIOSSession(ctx context.Context, host string, session *common.ScanSession) (*NetBIOSInfo, error) {
 	target := fmt.Sprintf("%s:139", host)
 
-	conn, err := common.WrapperTcpWithTimeout("tcp", target, config.Timeout)
+	conn, err := session.DialTCP(ctx, "tcp", target, session.Config.Timeout)
 	if err != nil {
 		return nil, fmt.Errorf("连接NetBIOS会话服务失败: %w", err)
 	}
 	defer func() { _ = conn.Close() }()
 
-	_ = conn.SetDeadline(time.Now().Add(config.Timeout))
+	_ = conn.SetDeadline(time.Now().Add(session.Config.Timeout))
 
 	// 发送SMB协商数据包
 	smbNegotiate1 := []byte{