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/oracle.go

@@ -30,7 +30,7 @@ func (p *OraclePlugin) Scan(ctx context.Context, info *common.HostInfo, session
 	target := info.Target()
 
 	if config.DisableBrute {
-		return p.identifyService(ctx, info, config, state)
+		return p.identifyService(ctx, info, session)
 	}
 
 	// 先测试未授权访问
@@ -180,10 +180,10 @@ func (p *OraclePlugin) testUnauthorizedAccess(ctx context.Context, info *common.
 	return nil
 }
 
-func (p *OraclePlugin) identifyService(ctx context.Context, info *common.HostInfo, config *common.Config, state *common.State) *ScanResult {
+func (p *OraclePlugin) identifyService(ctx context.Context, info *common.HostInfo, session *common.ScanSession) *ScanResult {
 	target := info.Target()
 
-	conn, err := common.WrapperTcpWithTimeout("tcp", target, config.Timeout)
+	conn, err := session.DialTCP(ctx, "tcp", target, session.Config.Timeout)
 	if err != nil {
 		return &ScanResult{
 			Success: false,