feat(platform): expose coverage service status

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

@@ -478,6 +478,57 @@ func buildVehicleServiceStatus(resolved bool, statuses []VehicleSourceStatus) *V
 	}
 }
 
+func buildVehicleCoverageServiceStatus(row VehicleCoverageRow) *VehicleServiceStatus {
+	if row.BindingStatus != "bound" {
+		return &VehicleServiceStatus{
+			Status:            "identity_required",
+			Severity:          "warning",
+			Title:             "身份未绑定",
+			Detail:            "车辆身份绑定不完整，需先维护 VIN、车牌或手机号映射。",
+			SourceCount:       row.SourceCount,
+			OnlineSourceCount: row.OnlineSourceCount,
+		}
+	}
+	if row.SourceCount == 0 {
+		return &VehicleServiceStatus{
+			Status:            "no_data",
+			Severity:          "warning",
+			Title:             "暂无数据来源",
+			Detail:            "车辆已绑定，但暂未查询到 32960、808 或 MQTT 数据来源。",
+			SourceCount:       row.SourceCount,
+			OnlineSourceCount: row.OnlineSourceCount,
+		}
+	}
+	if row.OnlineSourceCount == 0 {
+		return &VehicleServiceStatus{
+			Status:            "offline",
+			Severity:          "error",
+			Title:             "车辆离线",
+			Detail:            "所有已知数据来源均未在线，需要检查平台转发、终端上报或链路状态。",
+			SourceCount:       row.SourceCount,
+			OnlineSourceCount: row.OnlineSourceCount,
+		}
+	}
+	if row.OnlineSourceCount < row.SourceCount {
+		return &VehicleServiceStatus{
+			Status:            "degraded",
+			Severity:          "warning",
+			Title:             "部分来源离线",
+			Detail:            sourceCoverageDetail(row.SourceCount, row.OnlineSourceCount, "车辆服务可用但需要关注离线来源。"),
+			SourceCount:       row.SourceCount,
+			OnlineSourceCount: row.OnlineSourceCount,
+		}
+	}
+	return &VehicleServiceStatus{
+		Status:            "healthy",
+		Severity:          "ok",
+		Title:             "服务正常",
+		Detail:            sourceCoverageDetail(row.SourceCount, row.OnlineSourceCount, "全部已知来源在线。"),
+		SourceCount:       row.SourceCount,
+		OnlineSourceCount: row.OnlineSourceCount,
+	}
+}
+
 func sourceCoverageDetail(sourceCount int, onlineSourceCount int, suffix string) string {
 	return strconv.Itoa(onlineSourceCount) + "/" + strconv.Itoa(sourceCount) + " 个来源在线，" + suffix
 }