[功能] 优化仪表板概览数据结构，添加压缩和规范化功能

openflare_server/router/api_phase2_test.go

@@ -170,7 +170,9 @@ func TestPhase2AgentLifecycle(t *testing.T) {
 	createRouteAndPublishVersion(t, engine, adminToken)
 
 	dashboardResp := performJSONRequest(t, engine, adminToken, http.MethodGet, "/api/dashboard/overview", nil)
-	var dashboard service.DashboardOverviewView
+	var dashboard struct {
+		Summary service.DashboardSummary `json:"summary"`
+	}
 	decodeResponseData(t, dashboardResp, &dashboard)
 	if dashboard.Summary.TotalNodes != 0 {
 		t.Fatalf("expected empty dashboard node summary before node registration, got %+v", dashboard.Summary)