feat(monitor): aggregate nationwide fleet by province

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

@@ -25,13 +25,14 @@ type MonitorSummary struct {
 }
 
 type MonitorMapResponse struct {
-	Mode      string              `json:"mode"`
-	Zoom      int                 `json:"zoom"`
-	Total     int                 `json:"total"`
-	Truncated bool                `json:"truncated"`
-	Points    []MonitorMapPoint   `json:"points"`
-	Clusters  []MonitorMapCluster `json:"clusters"`
-	AsOf      string              `json:"asOf"`
+	Mode           string                    `json:"mode"`
+	Zoom           int                       `json:"zoom"`
+	Total          int                       `json:"total"`
+	Truncated      bool                      `json:"truncated"`
+	Points         []MonitorMapPoint         `json:"points"`
+	Clusters       []MonitorMapCluster       `json:"clusters"`
+	ProvincePoints []MonitorMapProvincePoint `json:"provincePoints"`
+	AsOf           string                    `json:"asOf"`
 }
 
 type MonitorWorkspaceResponse struct {
@@ -69,6 +70,16 @@ type MonitorMapCluster struct {
 	Unknown   int     `json:"unknown"`
 }
 
+// MonitorMapProvincePoint is deliberately compact and identity-free. At the
+// nationwide zoom the browser groups these already-scoped coordinates with
+// AMap's cached administrative boundary node, while Clusters remain available
+// as a no-blank-map fallback if the boundary resource cannot be loaded.
+type MonitorMapProvincePoint struct {
+	Longitude float64 `json:"longitude"`
+	Latitude  float64 `json:"latitude"`
+	Status    string  `json:"status"`
+}
+
 type TrackPlaybackResponse struct {
 	VIN       string                `json:"vin"`
 	Plate     string                `json:"plate"`