feat(platform): keep canonical source summary slots

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

@@ -261,6 +261,7 @@ func (m *MockStore) VehicleServiceSummary(ctx context.Context) (VehicleServiceSu
 	for _, protocol := range protocolCounts {
 		summary.Protocols = append(summary.Protocols, *protocol)
 	}
+	summary.Protocols = completeProtocolStats(summary.Protocols)
 	for _, protocol := range canonicalVehicleProtocols {
 		missing := 0
 		for _, row := range coverage.Items {
@@ -271,7 +272,6 @@ func (m *MockStore) VehicleServiceSummary(ctx context.Context) (VehicleServiceSu
 		summary.MissingSources = append(summary.MissingSources, MissingSourceStat{Protocol: protocol, Count: missing})
 	}
 	sort.Slice(summary.ServiceStatuses, func(i, j int) bool { return summary.ServiceStatuses[i].Status < summary.ServiceStatuses[j].Status })
-	sort.Slice(summary.Protocols, func(i, j int) bool { return summary.Protocols[i].Protocol < summary.Protocols[j].Protocol })
 	return summary, nil
 }
 

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

@@ -923,7 +923,10 @@ func (s *ProductionStore) protocolStats(ctx context.Context) ([]ProtocolStat, er
 		}
 		out = append(out, row)
 	}
-	return out, rows.Err()
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return completeProtocolStats(out), nil
 }
 
 func parsedFieldsFromString(value string) map[string]any {

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

@@ -58,6 +58,37 @@ type Service struct {
 
 var canonicalVehicleProtocols = []string{"GB32960", "JT808", "YUTONG_MQTT"}
 
+func completeProtocolStats(stats []ProtocolStat) []ProtocolStat {
+	byProtocol := make(map[string]ProtocolStat, len(stats)+len(canonicalVehicleProtocols))
+	for _, stat := range stats {
+		protocol := strings.TrimSpace(stat.Protocol)
+		if protocol == "" {
+			continue
+		}
+		stat.Protocol = protocol
+		byProtocol[protocol] = stat
+	}
+	out := make([]ProtocolStat, 0, len(byProtocol)+len(canonicalVehicleProtocols))
+	seen := map[string]struct{}{}
+	for _, protocol := range canonicalVehicleProtocols {
+		stat := byProtocol[protocol]
+		stat.Protocol = protocol
+		out = append(out, stat)
+		seen[protocol] = struct{}{}
+	}
+	extra := make([]string, 0)
+	for protocol := range byProtocol {
+		if _, ok := seen[protocol]; !ok {
+			extra = append(extra, protocol)
+		}
+	}
+	sort.Strings(extra)
+	for _, protocol := range extra {
+		out = append(out, byProtocol[protocol])
+	}
+	return out
+}
+
 func missingCanonicalProtocols(protocols []string) []string {
 	missing := make([]string, 0, len(canonicalVehicleProtocols))
 	for _, protocol := range canonicalVehicleProtocols {

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

@@ -83,3 +83,22 @@ func TestVehicleServiceSummaryCountsProtocolOnlineByProtocolSlot(t *testing.T) {
 		t.Fatalf("GB32960 online count must use GB32960 source status only, got %+v", gb32960)
 	}
 }
+
+func TestCompleteProtocolStatsIncludesCanonicalSlots(t *testing.T) {
+	stats := completeProtocolStats([]ProtocolStat{{Protocol: "JT808", Online: 2, Total: 5}})
+	byProtocol := map[string]ProtocolStat{}
+	for _, stat := range stats {
+		byProtocol[stat.Protocol] = stat
+	}
+	for _, protocol := range canonicalVehicleProtocols {
+		if _, ok := byProtocol[protocol]; !ok {
+			t.Fatalf("canonical protocol %s should be present, got %+v", protocol, stats)
+		}
+	}
+	if byProtocol["JT808"].Online != 2 || byProtocol["JT808"].Total != 5 {
+		t.Fatalf("existing protocol stats should be preserved, got %+v", byProtocol["JT808"])
+	}
+	if byProtocol["GB32960"].Online != 0 || byProtocol["GB32960"].Total != 0 {
+		t.Fatalf("missing canonical protocol should be exposed as zero slot, got %+v", byProtocol["GB32960"])
+	}
+}