refactor(go): remove source endpoint from realtime snapshots

go/vehicle-gateway/internal/realtime/repository_test.go

@@ -380,11 +380,12 @@ func TestHandlerReturnsMergedSnapshot(t *testing.T) {
 	repo, closeFn := newTestRepository(t)
 	defer closeFn()
 	if err := repo.Update(context.Background(), envelope.FrameEnvelope{
-		Protocol:     envelope.ProtocolJT808,
-		VIN:          "VIN001",
-		EventTimeMS:  1000,
-		ReceivedAtMS: 1100,
-		Fields:       map[string]any{envelope.FieldSpeedKMH: 12.3},
+		Protocol:       envelope.ProtocolJT808,
+		VIN:            "VIN001",
+		SourceEndpoint: "115.231.168.135:43625",
+		EventTimeMS:    1000,
+		ReceivedAtMS:   1100,
+		Fields:         map[string]any{envelope.FieldSpeedKMH: 12.3},
 	}); err != nil {
 		t.Fatalf("Update() error = %v", err)
 	}
@@ -398,6 +399,9 @@ func TestHandlerReturnsMergedSnapshot(t *testing.T) {
 	if !stringsContains(rec.Body.String(), `"vin":"VIN001"`) {
 		t.Fatalf("unexpected body: %s", rec.Body.String())
 	}
+	if stringsContains(rec.Body.String(), "source_endpoint") {
+		t.Fatalf("realtime snapshot should not expose source_endpoint: %s", rec.Body.String())
+	}
 }
 
 func TestHandlerReturnsPhoneOnlyVehicleKeySnapshot(t *testing.T) {