feat(diagnosis): add protocol-aware connectivity diagnosis for tunnel chains

- Pass tunnel protocol through diagnosis work items
- Support protocol-specific ping (TCP/UDP/KCP) via remote nodes
- Add KCP probe support in websocket_reporter for chain hop testing

go-backend/internal/store/model/model.go

@@ -546,6 +546,7 @@ type TunnelRecord struct {
 	Status       int
 	Flow         int64
 	TrafficRatio float64
+	Protocol     string
 }
 
 type UserQuotaView struct {

go-backend/internal/store/repo/repository_flow.go

@@ -158,6 +158,7 @@ func (r *Repository) GetTunnelRecord(tunnelID int64) (*model.TunnelRecord, error
 		Status:       t.Status,
 		Flow:         t.Flow,
 		TrafficRatio: t.TrafficRatio,
+		Protocol:     t.Protocol,
 	}
 	if tr.Flow <= 0 {
 		tr.Flow = 1