feat(platform): expose missing sources per vehicle

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}
 }