test(frontend): align admin usage typing with upstream model

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent

)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

frontend/src/components/admin/usage/__tests__/UsageTable.spec.ts

@@ -39,6 +39,7 @@ const DataTableStub = {
   template: `
     <div>
       <div v-for="row in data" :key="row.request_id">
+        <slot name="cell-model" :row="row" :value="row.model" />
         <slot name="cell-cost" :row="row" />
       </div>
     </div>
@@ -108,4 +109,42 @@ describe('admin UsageTable tooltip', () => {
     expect(text).toContain('$30.0000 / 1M tokens')
     expect(text).toContain('$0.069568')
   })
+
+  it('shows requested and upstream models separately for admin rows', () => {
+    const row = {
+      request_id: 'req-admin-model-1',
+      model: 'claude-sonnet-4',
+      upstream_model: 'claude-sonnet-4-20250514',
+      actual_cost: 0,
+      total_cost: 0,
+      account_rate_multiplier: 1,
+      rate_multiplier: 1,
+      input_cost: 0,
+      output_cost: 0,
+      cache_creation_cost: 0,
+      cache_read_cost: 0,
+      input_tokens: 0,
+      output_tokens: 0,
+    }
+
+    const wrapper = mount(UsageTable, {
+      props: {
+        data: [row],
+        loading: false,
+        columns: [],
+      },
+      global: {
+        stubs: {
+          DataTable: DataTableStub,
+          EmptyState: true,
+          Icon: true,
+          Teleport: true,
+        },
+      },
+    })
+
+    const text = wrapper.text()
+    expect(text).toContain('claude-sonnet-4')
+    expect(text).toContain('claude-sonnet-4-20250514')
+  })
 })

frontend/src/types/index.ts

@@ -978,7 +978,6 @@ export interface UsageLog {
   account_id: number | null
   request_id: string
   model: string
-  upstream_model?: string | null
   service_tier?: string | null
   reasoning_effort?: string | null
   inbound_endpoint?: string | null
@@ -1033,6 +1032,8 @@ export interface UsageLogAccountSummary {
 }
 
 export interface AdminUsageLog extends UsageLog {
+  upstream_model?: string | null
+
   // 账号计费倍率（仅管理员可见）
   account_rate_multiplier?: number | null