feat(platform): expose missing sources per vehicle

vehicle-data-platform/apps/api/internal/platform/handler_test.go

@@ -92,6 +92,18 @@ func TestHandlerVehicleCoverage(t *testing.T) {
 	if body.Data.Items[0].ServiceStatus.Status != "degraded" {
 		t.Fatalf("coverage row should expose degraded status, got %+v", body.Data.Items[0].ServiceStatus)
 	}
+	var rawBody struct {
+		Data Page[struct {
+			VIN              string   `json:"vin"`
+			MissingProtocols []string `json:"missingProtocols"`
+		}] `json:"data"`
+	}
+	if err := json.Unmarshal(rec.Body.Bytes(), &rawBody); err != nil {
+		t.Fatalf("response JSON should decode missing source evidence: %v body=%s", err, rec.Body.String())
+	}
+	if len(rawBody.Data.Items) == 0 || !containsString(rawBody.Data.Items[0].MissingProtocols, "YUTONG_MQTT") {
+		t.Fatalf("coverage row should expose missing canonical protocols, got %+v body=%s", rawBody.Data.Items, rec.Body.String())
+	}
 }
 
 func TestHandlerVehicleCoverageFiltersServiceStatus(t *testing.T) {

vehicle-data-platform/apps/api/internal/platform/mock_store.go

@@ -132,6 +132,7 @@ func (m *MockStore) VehicleCoverage(_ context.Context, query url.Values) (Page[V
 	}
 	items := make([]VehicleCoverageRow, 0, len(byVIN))
 	for _, row := range byVIN {
+		row.MissingProtocols = missingCanonicalProtocols(row.Protocols)
 		row.ServiceStatus = buildVehicleCoverageServiceStatus(*row)
 		if keepCoverageRow(*row, query) {
 			items = append(items, *row)

vehicle-data-platform/apps/api/internal/platform/model.go

@@ -55,6 +55,7 @@ type VehicleCoverageRow struct {
 	Phone             string                `json:"phone"`
 	OEM               string                `json:"oem"`
 	Protocols         []string              `json:"protocols"`
+	MissingProtocols  []string              `json:"missingProtocols"`
 	SourceCount       int                   `json:"sourceCount"`
 	OnlineSourceCount int                   `json:"onlineSourceCount"`
 	Online            bool                  `json:"online"`

vehicle-data-platform/apps/api/internal/platform/production_store.go

@@ -268,6 +268,7 @@ func (s *ProductionStore) VehicleCoverage(ctx context.Context, query url.Values)
 			return Page[VehicleCoverageRow]{}, err
 		}
 		row.Protocols = splitCSV(protocols)
+		row.MissingProtocols = missingCanonicalProtocols(row.Protocols)
 		row.Online = online == 1
 		row.ServiceStatus = buildVehicleCoverageServiceStatus(row)
 		items = append(items, row)

vehicle-data-platform/apps/api/internal/platform/service.go

@@ -58,6 +58,16 @@ type Service struct {
 
 var canonicalVehicleProtocols = []string{"GB32960", "JT808", "YUTONG_MQTT"}
 
+func missingCanonicalProtocols(protocols []string) []string {
+	missing := make([]string, 0, len(canonicalVehicleProtocols))
+	for _, protocol := range canonicalVehicleProtocols {
+		if !containsString(protocols, protocol) {
+			missing = append(missing, protocol)
+		}
+	}
+	return missing
+}
+
 func NewService(store Store) *Service {
 	return &Service{store: store}
 }