feat(usage): 使用记录展示映射前的推理强度

用量行新增 requested_reasoning_effort，记录分组策略与模型族改写前的客户端请求值；推理强度列与模型列一致，主行显示请求值，有映射时用 ↳ 展示实际转发值。

frontend/src/components/admin/usage/UsageTable.vue

@@ -91,8 +91,16 @@
         </template>
 
         <template #cell-reasoning_effort="{ row }">
-          <span class="text-sm text-gray-900 dark:text-white">
-            {{ formatReasoningEffort(row.reasoning_effort) }}
+          <div v-if="hasReasoningEffortMapping(row)" class="space-y-0.5 text-xs">
+            <div class="font-medium text-gray-900 dark:text-white">
+              {{ formatReasoningEffort(row.requested_reasoning_effort) }}
+            </div>
+            <div class="text-gray-500 dark:text-gray-400">
+              <span class="mr-0.5">↳</span>{{ formatReasoningEffort(row.reasoning_effort) }}
+            </div>
+          </div>
+          <span v-else class="text-sm text-gray-900 dark:text-white">
+            {{ formatReasoningEffort(row.requested_reasoning_effort || row.reasoning_effort) }}
           </span>
         </template>
 
@@ -500,7 +508,7 @@
 import { computed, ref } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useAppStore } from '@/stores/app'
-import { formatDateTime, formatReasoningEffort } from '@/utils/format'
+import { formatDateTime, formatReasoningEffort, reasoningEffortValuesEqual } from '@/utils/format'
 import { formatCacheTokens, formatMultiplier } from '@/utils/formatters'
 import { formatTokenPricePerMillion } from '@/utils/usagePricing'
 import { getUsageServiceTierLabel } from '@/utils/usageServiceTier'
@@ -587,6 +595,12 @@ const ipGeoBatchLoading = ref(false)
 
 const showIpGeoToolbar = computed(() => props.columns.some((col) => col.key === 'ip_address'))
 
+const hasReasoningEffortMapping = (row: AdminUsageLog): boolean => {
+  const requested = row.requested_reasoning_effort?.trim() || ''
+  const forwarded = row.reasoning_effort?.trim() || ''
+  return requested !== '' && forwarded !== '' && !reasoningEffortValuesEqual(requested, forwarded)
+}
+
 const sentUpstreamModel = (row: AdminUsageLog): string => row.upstream_model?.trim() || row.model?.trim() || ''
 
 const normalizeModelVariant = (model: string): string => model

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

@@ -84,6 +84,7 @@ const DataTableStub = {
     <div>
       <div v-for="row in data" :key="row.request_id">
         <slot name="cell-model" :row="row" :value="row.model" />
+        <slot name="cell-reasoning_effort" :row="row" :value="row.reasoning_effort" />
         <slot name="cell-billing_mode" :row="row" />
         <slot name="cell-tokens" :row="row" />
         <slot name="cell-cost" :row="row" />
@@ -256,6 +257,61 @@ describe('admin UsageTable tooltip', () => {
     expect(text).toContain('claude-sonnet-4-20250514')
   })
 
+  it('shows requested and forwarded reasoning effort separately when they differ', () => {
+    const wrapper = mount(UsageTable, {
+      props: {
+        data: [{
+          request_id: 'req-admin-effort-1',
+          model: 'gpt-5.4',
+          requested_reasoning_effort: 'max',
+          reasoning_effort: 'xhigh',
+        }],
+        loading: false,
+        columns: [],
+      },
+      global: {
+        stubs: {
+          DataTable: DataTableStub,
+          EmptyState: true,
+          Icon: true,
+          Teleport: true,
+        },
+      },
+    })
+
+    const text = wrapper.text()
+    expect(text).toContain('Max')
+    expect(text).toContain('XHigh')
+    expect(text).toContain('↳')
+  })
+
+  it('shows a single reasoning effort when requested matches forwarded', () => {
+    const wrapper = mount(UsageTable, {
+      props: {
+        data: [{
+          request_id: 'req-admin-effort-2',
+          model: 'gpt-5.6-sol',
+          requested_reasoning_effort: 'max',
+          reasoning_effort: 'max',
+        }],
+        loading: false,
+        columns: [],
+      },
+      global: {
+        stubs: {
+          DataTable: DataTableStub,
+          EmptyState: true,
+          Icon: true,
+          Teleport: true,
+        },
+      },
+    })
+
+    const text = wrapper.text()
+    expect(text).toContain('Max')
+    expect(text).not.toContain('↳')
+  })
+
 	it.each([
 		{
 			name: 'possible version variant',
@@ -561,6 +617,7 @@ const DataTableStubWithUser = {
       <div v-for="row in data" :key="row.request_id">
         <slot name="cell-user" :row="row" />
         <slot name="cell-model" :row="row" :value="row.model" />
+        <slot name="cell-reasoning_effort" :row="row" :value="row.reasoning_effort" />
         <slot name="cell-billing_mode" :row="row" />
         <slot name="cell-tokens" :row="row" />
         <slot name="cell-cost" :row="row" />