fix: batch 1 audit fixes — quota SQL fixed mode, public recharge URL, WebSearch bool fallback, UpdatePlan validation

H1: incrementUsageBillingAccountQuota now uses shared dailyExpiredExpr/weeklyExpiredExpr
    constants (supporting fixed reset mode) instead of hardcoded '24 hours'/'168 hours'
H4: public settings endpoint now maps balance_low_notify_recharge_url
H6: GetWebSearchEmulationMode tolerates legacy bool values (true→enabled)
H7: UpdatePlan validates non-nil patch fields (rejects negative price, empty name, etc.)
H8: UsageTable accountBilled() helper with total_cost ?? 0 null guard
H9: AdminUsageLog TS type adds channel_id + billing_tier
M2: account.go "fixed" literals replaced with thresholdTypeFixed constant
M13: SystemSettings TS type adds web_search_emulation_enabled
UI: QuotaLimitCard title labels now use flex-1 to align with flex-1 input boxes

frontend/src/api/admin/settings.ts

@@ -114,6 +114,7 @@ export interface SystemSettings {
   enable_fingerprint_unification: boolean
   enable_metadata_passthrough: boolean
   enable_cch_signing: boolean
+  web_search_emulation_enabled?: boolean
 
   // Payment configuration
   payment_enabled: boolean

frontend/src/components/account/QuotaLimitCard.vue

@@ -201,8 +201,8 @@ const onWeeklyModeChange = (e: Event) => {
         <div>
           <!-- 标题行（仅全局通知开启时显示） -->
           <div v-if="quotaNotifyGlobalEnabled" class="flex items-center gap-2 mb-1">
-            <span class="text-xs font-medium text-gray-700 dark:text-gray-300 w-28 flex-shrink-0">{{ t('admin.accounts.quotaDailyLimit') }}</span>
-            <span v-if="dailyLimit && dailyLimit > 0" class="text-xs font-medium text-gray-700 dark:text-gray-300">{{ t('admin.accounts.quotaNotify.alert') }}</span>
+            <span class="text-xs font-medium text-gray-700 dark:text-gray-300 flex-1 min-w-0">{{ t('admin.accounts.quotaDailyLimit') }}</span>
+            <span v-if="dailyLimit && dailyLimit > 0" class="text-xs font-medium text-gray-700 dark:text-gray-300 flex-1 min-w-0">{{ t('admin.accounts.quotaNotify.alert') }}</span>
           </div>
           <label v-else class="text-xs font-medium text-gray-700 dark:text-gray-300 mb-1 block">{{ t('admin.accounts.quotaDailyLimit') }}</label>
           <!-- 输入行 -->
@@ -240,8 +240,8 @@ const onWeeklyModeChange = (e: Event) => {
         <!-- 周配额 -->
         <div>
           <div v-if="quotaNotifyGlobalEnabled" class="flex items-center gap-2 mb-1">
-            <span class="text-xs font-medium text-gray-700 dark:text-gray-300 w-28 flex-shrink-0">{{ t('admin.accounts.quotaWeeklyLimit') }}</span>
-            <span v-if="weeklyLimit && weeklyLimit > 0" class="text-xs font-medium text-gray-700 dark:text-gray-300">{{ t('admin.accounts.quotaNotify.alert') }}</span>
+            <span class="text-xs font-medium text-gray-700 dark:text-gray-300 flex-1 min-w-0">{{ t('admin.accounts.quotaWeeklyLimit') }}</span>
+            <span v-if="weeklyLimit && weeklyLimit > 0" class="text-xs font-medium text-gray-700 dark:text-gray-300 flex-1 min-w-0">{{ t('admin.accounts.quotaNotify.alert') }}</span>
           </div>
           <label v-else class="text-xs font-medium text-gray-700 dark:text-gray-300 mb-1 block">{{ t('admin.accounts.quotaWeeklyLimit') }}</label>
           <div class="flex items-center gap-2">
@@ -290,8 +290,8 @@ const onWeeklyModeChange = (e: Event) => {
         <!-- 总配额 -->
         <div>
           <div v-if="quotaNotifyGlobalEnabled" class="flex items-center gap-2 mb-1">
-            <span class="text-xs font-medium text-gray-700 dark:text-gray-300 w-28 flex-shrink-0">{{ t('admin.accounts.quotaTotalLimit') }}</span>
-            <span v-if="totalLimit && totalLimit > 0" class="text-xs font-medium text-gray-700 dark:text-gray-300">{{ t('admin.accounts.quotaNotify.alert') }}</span>
+            <span class="text-xs font-medium text-gray-700 dark:text-gray-300 flex-1 min-w-0">{{ t('admin.accounts.quotaTotalLimit') }}</span>
+            <span v-if="totalLimit && totalLimit > 0" class="text-xs font-medium text-gray-700 dark:text-gray-300 flex-1 min-w-0">{{ t('admin.accounts.quotaNotify.alert') }}</span>
           </div>
           <label v-else class="text-xs font-medium text-gray-700 dark:text-gray-300 mb-1 block">{{ t('admin.accounts.quotaTotalLimit') }}</label>
           <div class="flex items-center gap-2">

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

@@ -155,7 +155,7 @@
               </div>
             </div>
             <div v-if="row.account_rate_multiplier != null" class="mt-0.5 text-[11px] text-gray-400">
-              A ${{ (row.total_cost * row.account_rate_multiplier).toFixed(6) }}
+              A ${{ accountBilled(row).toFixed(6) }}
             </div>
           </div>
         </template>
@@ -328,7 +328,11 @@
           <div class="flex items-center justify-between gap-6 border-t border-gray-700 pt-1.5">
             <span class="text-gray-400">{{ t('usage.accountBilled') }}</span>
             <span class="font-semibold text-green-400">
-              ${{ (((tooltipData?.total_cost || 0) * (tooltipData?.account_rate_multiplier ?? 1)) || 0).toFixed(6) }}
+              ${{ accountBilled({
+                total_cost: tooltipData?.total_cost,
+                account_stats_cost: tooltipData?.account_stats_cost,
+                account_rate_multiplier: tooltipData?.account_rate_multiplier,
+              }).toFixed(6) }}
             </span>
           </div>
         </div>
@@ -347,6 +351,13 @@ import { formatTokenPricePerMillion } from '@/utils/usagePricing'
 import { getUsageServiceTierLabel } from '@/utils/usageServiceTier'
 import { resolveUsageRequestType } from '@/utils/usageRequestType'
 import { getBillingModeLabel, getBillingModeBadgeClass } from '@/utils/billingMode'
+
+/** Compute the account-billed cost for display: (account_stats_cost ?? total_cost) * rate_multiplier */
+function accountBilled(row: { total_cost?: number | null; account_stats_cost?: number | null; account_rate_multiplier?: number | null }): number {
+  const base = row.account_stats_cost != null ? row.account_stats_cost : (row.total_cost ?? 0)
+  return base * (row.account_rate_multiplier ?? 1)
+}
+
 import DataTable from '@/components/common/DataTable.vue'
 import EmptyState from '@/components/common/EmptyState.vue'
 import Icon from '@/components/icons/Icon.vue'

frontend/src/types/index.ts

@@ -1067,6 +1067,10 @@ export interface AdminUsageLog extends UsageLog {
   // 账号计费倍率（仅管理员可见）
   account_rate_multiplier?: number | null
 
+  // 渠道 ID 和计费等级（仅管理员可见）
+  channel_id?: number | null
+  billing_tier?: string | null
+
   // 用户请求 IP（仅管理员可见）
   ip_address?: string | null