feat(usage): add account cost to breakdown sub-table and admin usage log

- UserBreakdownItem: add AccountCost field + SQL aggregation
- UserBreakdownSubTable: add orange account cost column
- Admin usage table: add account_cost column (after cost, default visible)
- Column settings: add account_cost toggle option

backend/internal/pkg/usagestats/usage_log_types.go

@@ -170,6 +170,7 @@ type UserBreakdownItem struct {
 	TotalTokens int64   `json:"total_tokens"`
 	Cost        float64 `json:"cost"`         // 标准计费
 	ActualCost  float64 `json:"actual_cost"`  // 实际扣除
+	AccountCost float64 `json:"account_cost"` // 账号成本
 }
 
 // UserBreakdownDimension specifies the dimension to filter for user breakdown.

backend/internal/repository/usage_log_repo.go

@@ -3157,7 +3157,8 @@ func (r *usageLogRepository) GetUserBreakdownStats(ctx context.Context, startTim
 			COUNT(*) as requests,
 			COALESCE(SUM(ul.input_tokens + ul.output_tokens + ul.cache_creation_tokens + ul.cache_read_tokens), 0) as total_tokens,
 			COALESCE(SUM(ul.total_cost), 0) as cost,
-			COALESCE(SUM(ul.actual_cost), 0) as actual_cost
+			COALESCE(SUM(ul.actual_cost), 0) as actual_cost,
+			COALESCE(SUM(COALESCE(ul.account_stats_cost, ul.total_cost) * COALESCE(ul.account_rate_multiplier, 1)), 0) as account_cost
 		FROM usage_logs ul
 		LEFT JOIN users u ON u.id = ul.user_id
 		WHERE ul.created_at >= $1 AND ul.created_at < $2
@@ -3228,6 +3229,7 @@ func (r *usageLogRepository) GetUserBreakdownStats(ctx context.Context, startTim
 			&row.TotalTokens,
 			&row.Cost,
 			&row.ActualCost,
+			&row.AccountCost,
 		); err != nil {
 			return nil, err
 		}

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

@@ -160,6 +160,12 @@
           </div>
         </template>
 
+        <template #cell-account_cost="{ row }">
+          <span class="text-sm font-medium text-orange-500 dark:text-orange-400">
+            ${{ accountBilled(row).toFixed(6) }}
+          </span>
+        </template>
+
         <template #cell-first_token="{ row }">
           <span v-if="row.first_token_ms != null" class="text-sm text-gray-600 dark:text-gray-400">{{ formatDuration(row.first_token_ms) }}</span>
           <span v-else class="text-sm text-gray-400 dark:text-gray-500">-</span>

frontend/src/components/charts/UserBreakdownSubTable.vue

@@ -25,6 +25,9 @@
           <td class="py-1 text-right text-green-600 dark:text-green-400">
             ${{ formatCost(user.actual_cost) }}
           </td>
+          <td class="py-1 text-right text-orange-500 dark:text-orange-400">
+            ${{ formatCost(user.account_cost) }}
+          </td>
           <td class="py-1 pr-1 text-right text-gray-400 dark:text-gray-500">
             ${{ formatCost(user.cost) }}
           </td>

frontend/src/types/index.ts

@@ -1245,6 +1245,7 @@ export interface UserBreakdownItem {
   total_tokens: number
   cost: number
   actual_cost: number
+  account_cost: number
 }
 
 export interface UserUsageTrendPoint {

frontend/src/views/admin/UsageView.vue

@@ -533,6 +533,7 @@ const allColumns = computed(() => [
   { key: 'billing_mode', label: t('admin.usage.billingMode'), sortable: false },
   { key: 'tokens', label: t('usage.tokens'), sortable: false },
   { key: 'cost', label: t('usage.cost'), sortable: false },
+  { key: 'account_cost', label: t('usage.accountCost'), sortable: false },
   { key: 'first_token', label: t('usage.firstToken'), sortable: false },
   { key: 'duration', label: t('usage.duration'), sortable: false },
   { key: 'created_at', label: t('usage.time'), sortable: true },