fix: 高峰倍率全链路透传、计费术语修正与边界处理

- 高峰倍率信息透传至可用渠道、支付计划、结算信息等 API，前端
  GroupBadge / GroupOptionItem / SubscriptionPlanCard / PaymentView /
  SubscriptionsView 统一展示高峰时段与倍率标签
- 修正计费术语："文本倍率" → "token 倍率"，明确高峰倍率同时作用于
  token 计费的图片 token，图片按次计费不受高峰影响
- 允许高峰倍率 multiplier=0，支持高峰时段免费策略
- 切换分组类型为 standard 时自动清除高峰倍率配置
- 长上下文计费与标准计费路径改用内部实现，移除冗余中间调用
- 前端高峰倍率相关控件文案改为 i18n
- 新增多组高峰倍率相关单元测试

frontend/src/views/admin/GroupsView.vue

@@ -866,7 +866,7 @@
                 type="checkbox"
                 class="rounded border-gray-300 text-blue-600 focus:ring-blue-500"
               />
-              <span>启用高峰时段倍率</span>
+              <span>{{ t("admin.groups.peakRate.enable") }}</span>
             </label>
           </div>
           <div
@@ -874,7 +874,7 @@
             class="mb-4 grid grid-cols-3 gap-3"
           >
             <div>
-              <label class="input-label">高峰开始</label>
+              <label class="input-label">{{ t("admin.groups.peakRate.peakStart") }}</label>
               <input
                 v-model="createForm.peak_start"
                 type="time"
@@ -882,7 +882,7 @@
               />
             </div>
             <div>
-              <label class="input-label">高峰结束</label>
+              <label class="input-label">{{ t("admin.groups.peakRate.peakEnd") }}</label>
               <input
                 v-model="createForm.peak_end"
                 type="time"
@@ -890,7 +890,7 @@
               />
             </div>
             <div>
-              <label class="input-label">高峰倍率</label>
+              <label class="input-label">{{ t("admin.groups.peakRate.peakMultiplier") }}</label>
               <input
                 v-model.number="createForm.peak_rate_multiplier"
                 type="number"
@@ -898,6 +898,7 @@
                 min="0"
                 class="input"
                 placeholder="1"
+                :title="t('admin.groups.peakRate.multiplierHint')"
               />
             </div>
           </div>
@@ -2204,7 +2205,7 @@
                 type="checkbox"
                 class="rounded border-gray-300 text-blue-600 focus:ring-blue-500"
               />
-              <span>启用高峰时段倍率</span>
+              <span>{{ t("admin.groups.peakRate.enable") }}</span>
             </label>
           </div>
           <div
@@ -2212,7 +2213,7 @@
             class="mb-4 grid grid-cols-3 gap-3"
           >
             <div>
-              <label class="input-label">高峰开始</label>
+              <label class="input-label">{{ t("admin.groups.peakRate.peakStart") }}</label>
               <input
                 v-model="editForm.peak_start"
                 type="time"
@@ -2220,7 +2221,7 @@
               />
             </div>
             <div>
-              <label class="input-label">高峰结束</label>
+              <label class="input-label">{{ t("admin.groups.peakRate.peakEnd") }}</label>
               <input
                 v-model="editForm.peak_end"
                 type="time"
@@ -2228,7 +2229,7 @@
               />
             </div>
             <div>
-              <label class="input-label">高峰倍率</label>
+              <label class="input-label">{{ t("admin.groups.peakRate.peakMultiplier") }}</label>
               <input
                 v-model.number="editForm.peak_rate_multiplier"
                 type="number"
@@ -2236,6 +2237,7 @@
                 min="0"
                 class="input"
                 placeholder="1"
+                :title="t('admin.groups.peakRate.multiplierHint')"
               />
             </div>
           </div>

frontend/src/views/user/KeysView.vue

@@ -144,6 +144,10 @@
                   :subscription-type="row.group.subscription_type"
                   :rate-multiplier="row.group.rate_multiplier"
                   :user-rate-multiplier="userGroupRates[row.group.id]"
+                  :peak-rate-enabled="row.group.peak_rate_enabled"
+                  :peak-start="row.group.peak_start"
+                  :peak-end="row.group.peak_end"
+                  :peak-rate-multiplier="row.group.peak_rate_multiplier"
                 />
                 <span v-else class="text-sm text-gray-400 dark:text-dark-500">{{
                   t('keys.noGroup')
@@ -454,6 +458,10 @@
                 :subscription-type="(option as unknown as GroupOption).subscriptionType"
                 :rate-multiplier="(option as unknown as GroupOption).rate"
                 :user-rate-multiplier="(option as unknown as GroupOption).userRate"
+                :peak-rate-enabled="(option as unknown as GroupOption).peakRateEnabled"
+                :peak-start="(option as unknown as GroupOption).peakStart"
+                :peak-end="(option as unknown as GroupOption).peakEnd"
+                :peak-rate-multiplier="(option as unknown as GroupOption).peakRateMultiplier"
               />
               <span v-else class="text-gray-400">{{ t('keys.selectGroup') }}</span>
             </template>
@@ -464,6 +472,10 @@
                 :subscription-type="(option as unknown as GroupOption).subscriptionType"
                 :rate-multiplier="(option as unknown as GroupOption).rate"
                 :user-rate-multiplier="(option as unknown as GroupOption).userRate"
+                :peak-rate-enabled="(option as unknown as GroupOption).peakRateEnabled"
+                :peak-start="(option as unknown as GroupOption).peakStart"
+                :peak-end="(option as unknown as GroupOption).peakEnd"
+                :peak-rate-multiplier="(option as unknown as GroupOption).peakRateMultiplier"
                 :description="(option as unknown as GroupOption).description"
                 :selected="selected"
               />
@@ -1059,6 +1071,10 @@
               :subscription-type="option.subscriptionType"
               :rate-multiplier="option.rate"
               :user-rate-multiplier="option.userRate"
+              :peak-rate-enabled="option.peakRateEnabled"
+              :peak-start="option.peakStart"
+              :peak-end="option.peakEnd"
+              :peak-rate-multiplier="option.peakRateMultiplier"
               :description="option.description"
               :selected="
                 selectedKeyForGroup?.group_id === option.value ||
@@ -1123,6 +1139,10 @@ interface GroupOption {
   description: string | null
   rate: number
   userRate: number | null
+  peakRateEnabled: boolean
+  peakStart: string
+  peakEnd: string
+  peakRateMultiplier: number
   subscriptionType: SubscriptionType
   platform: GroupPlatform
 }
@@ -1351,6 +1371,10 @@ const groupOptions = computed(() =>
     description: group.description,
     rate: group.rate_multiplier,
     userRate: userGroupRates.value[group.id] ?? null,
+    peakRateEnabled: group.peak_rate_enabled,
+    peakStart: group.peak_start,
+    peakEnd: group.peak_end,
+    peakRateMultiplier: group.peak_rate_multiplier,
     subscriptionType: group.subscription_type,
     platform: group.platform
   }))

frontend/src/views/user/PaymentView.vue

@@ -121,6 +121,12 @@
                       <span :class="['text-lg font-bold', planTextClass]">×{{ selectedPlan.rate_multiplier ?? 1 }}</span>
                     </div>
                   </div>
+                  <div v-if="planHasPeakRate(selectedPlan)">
+                    <span class="text-xs text-gray-400 dark:text-gray-500">{{ t('payment.planCard.peakRate') }}</span>
+                    <div class="text-sm font-semibold text-amber-700 dark:text-amber-300">
+                      {{ planPeakRateLabel(selectedPlan) }}
+                    </div>
+                  </div>
                   <div v-if="selectedPlan.daily_limit_usd != null">
                     <span class="text-xs text-gray-400 dark:text-gray-500">{{ t('payment.planCard.dailyLimit') }}</span>
                     <div class="text-lg font-semibold text-gray-800 dark:text-gray-200">${{ selectedPlan.daily_limit_usd }}</div>
@@ -194,6 +200,7 @@
                       </div>
                       <div class="flex flex-wrap gap-x-3 text-[11px] text-gray-400 dark:text-gray-500">
                         <span>{{ t('payment.planCard.rate') }}: ×{{ sub.group?.rate_multiplier ?? 1 }}</span>
+                        <span v-if="subscriptionHasPeakRate(sub)">{{ t('payment.planCard.peakRate') }}: {{ subscriptionPeakRateLabel(sub) }}</span>
                         <span v-if="sub.group?.daily_limit_usd == null && sub.group?.weekly_limit_usd == null && sub.group?.monthly_limit_usd == null">{{ t('payment.planCard.quota') }}: {{ t('payment.planCard.unlimited') }}</span>
                         <span v-if="sub.expires_at">{{ t('userSubscriptions.daysRemaining', { days: getDaysRemaining(sub.expires_at) }) }}</span>
                         <span v-else>{{ t('userSubscriptions.noExpiration') }}</span>
@@ -297,6 +304,16 @@ function getDaysRemaining(expiresAt: string): number {
   return Math.max(0, Math.ceil(diff / (1000 * 60 * 60 * 24)))
 }
 
+function subscriptionHasPeakRate(sub: { group?: { peak_rate_enabled?: boolean; peak_start?: string; peak_end?: string } | null }): boolean {
+  const group = sub.group
+  return Boolean(group?.peak_rate_enabled && group.peak_start && group.peak_end)
+}
+
+function subscriptionPeakRateLabel(sub: { group?: { peak_start?: string; peak_end?: string; peak_rate_multiplier?: number } | null }): string {
+  const group = sub.group
+  return `${group?.peak_start}-${group?.peak_end} ×${group?.peak_rate_multiplier ?? 1}`
+}
+
 const loading = ref(true)
 const submitting = ref(false)
 const errorMessage = ref('')
@@ -695,6 +712,14 @@ const planValiditySuffix = computed(() => {
   return `${selectedPlan.value.validity_days}${t('payment.days')}`
 })
 
+function planHasPeakRate(plan: SubscriptionPlan): boolean {
+  return Boolean(plan.peak_rate_enabled && plan.peak_start && plan.peak_end)
+}
+
+function planPeakRateLabel(plan: SubscriptionPlan): string {
+  return `${plan.peak_start}-${plan.peak_end} ×${plan.peak_rate_multiplier ?? 1}`
+}
+
 function selectPlan(plan: SubscriptionPlan) {
   selectedPlan.value = plan
   errorMessage.value = ''

frontend/src/views/user/SubscriptionsView.vue

@@ -49,6 +49,12 @@
                 <p v-if="subscription.group?.description" class="mt-0.5 text-xs text-gray-500 dark:text-dark-400">
                   {{ subscription.group.description }}
                 </p>
+                <div class="mt-1 flex flex-wrap gap-x-3 gap-y-1 text-[11px] text-gray-400 dark:text-gray-500">
+                  <span>{{ t('payment.planCard.rate') }}: ×{{ subscription.group?.rate_multiplier ?? 1 }}</span>
+                  <span v-if="subscriptionHasPeakRate(subscription)" class="text-amber-700 dark:text-amber-300">
+                    {{ t('payment.planCard.peakRate') }}: {{ subscriptionPeakRateLabel(subscription) }}
+                  </span>
+                </div>
               </div>
             </div>
             <div class="flex items-center gap-2">
@@ -271,6 +277,16 @@ const appStore = useAppStore()
 const subscriptions = ref<UserSubscription[]>([])
 const loading = ref(true)
 
+function subscriptionHasPeakRate(subscription: UserSubscription): boolean {
+  const group = subscription.group
+  return Boolean(group?.peak_rate_enabled && group.peak_start && group.peak_end)
+}
+
+function subscriptionPeakRateLabel(subscription: UserSubscription): string {
+  const group = subscription.group
+  return `${group?.peak_start}-${group?.peak_end} ×${group?.peak_rate_multiplier ?? 1}`
+}
+
 async function loadSubscriptions() {
   try {
     loading.value = true