refactor(dashboard): switch usage charts to route group_by, rename Models card

Align dashboard with the route dimension introduced in the previous
commit:

* Token Usage / API Requests pie charts query the breakdown API with
  `group_by: ['date', 'route']` and aggregate via the new `route`
  dimension in `buildUsageLabel`. Visible chart titles keep the existing
  "by Model" wording — only the underlying data dim changed.
* Overview "Models" card label switched to `dashboard.deployments`
  ("部署" / "Deployments"), and the Active Models table heading to
  `dashboard.activeDeployments`. These reflect the underlying entity
  (model deployments) more accurately now that routes are the
  user-facing model concept.
* Drop 11 unused dashboard locale keys (`dashboard.title`,
  `dashboard.models`, `dashboard.allocategpus`, `dashboard.instances`,
  `dashboard.disk`, `dashboard.diskutilization`, `dashboard.apirequest`,
  `dashboard.activeModels`, `dashboard.activeUsers`,
  `dashboard.activeModels.name`, `dashboard.runninginstances`) — no
  remaining references in `src/` after the rename. Locale parity check
  passes.

src/pages/dashboard/components/active-table.tsx

@@ -106,7 +106,7 @@ const ActiveTable = () => {
                 fontWeight: 'var(--font-weight-bold)'
               }}
             >
-              {intl.formatMessage({ id: 'dashboard.activeModels' })}
+              {intl.formatMessage({ id: 'dashboard.activeDeployments' })}
             </span>
           }
           right={false}

src/pages/dashboard/components/new-usage.tsx

@@ -51,7 +51,7 @@ const NewUsage = () => {
         tokenByModelQuery.fetchData({
           ...commonParams,
           metric: 'total_tokens',
-          group_by: ['date', 'model'],
+          group_by: ['date', 'route'],
           sort_by: '-total_tokens'
         })
       ]);

src/pages/dashboard/components/usage-charts/api-requests-by-model.tsx

@@ -27,7 +27,7 @@ const ApiRequestsByModel: React.FC<ApiRequestsByModelProps> = ({
       .fetchData({
         ...commonParams,
         metric: 'api_requests',
-        group_by: ['date', 'model'],
+        group_by: ['date', 'route'],
         page: 1,
         perPage: 10,
         sort_by: '-api_requests'
@@ -36,7 +36,7 @@ const ApiRequestsByModel: React.FC<ApiRequestsByModelProps> = ({
   }, [commonParams]);
 
   const chartData = useMemo(
-    () => toUsagePieData(query.detailData, 'model', 'api_requests'),
+    () => toUsagePieData(query.detailData, 'route', 'api_requests'),
     [query.detailData]
   );
 

src/pages/dashboard/components/usage-charts/token-usage-by-model.tsx

@@ -21,7 +21,7 @@ const TokenUsageByModel: React.FC<TokenUsageByModelProps> = ({
   const intl = useIntl();
 
   const chartData = useMemo(
-    () => toUsagePieData(data, 'model', 'total_tokens'),
+    () => toUsagePieData(data, 'route', 'total_tokens'),
     [data]
   );
 

src/pages/dashboard/config/index.ts

@@ -22,7 +22,7 @@ export const overviewConfigs = [
 
   {
     key: 'model_count',
-    label: 'dashboard.models',
+    label: 'dashboard.deployments',
     backgroundColor: 'var(--color-white-1)'
   },
   {
@@ -41,7 +41,7 @@ export const baseColorMap = {
   baseR3: 'rgba(85,167,255,0.8)'
 };
 
-export type UsageGroupBy = 'model' | 'user' | 'api_key';
+export type UsageGroupBy = 'model' | 'route' | 'user' | 'api_key';
 export type UsageMetric = 'total_tokens' | 'api_requests';
 
 export interface UsageChartDatum {
@@ -104,6 +104,15 @@ export const buildUsageLabel = (item: BreakdownItem, groupBy: UsageGroupBy) => {
     return groupItem?.label || modelName || '-';
   }
 
+  if (groupBy === 'route') {
+    return (
+      groupItem?.label ||
+      identityValue?.route_name ||
+      groupValue?.route_name ||
+      '-'
+    );
+  }
+
   return (
     groupItem?.label ||
     identityValue?.user_name ||