fix: merge 30 general improvements from release branch

Bug fixes:
- Detached context for GetAccountConcurrencyBatch (prevent all-zero on request cancel)
- Filter soft-deleted users in GetByGroupID
- Stripe CSP policy (allow Stripe.js in script-src and frame-src)
- WebSearch API key validation on save
- RECHARGING status in payment result success check
- Windows test fixes (logger Sync deadlock, config path escaping)

Feature enhancements:
- Webhook multi-instance dispatch (extractOutTradeNo + GetWebhookProvider)
- EasyPay mobile H5 payment (device param + PayURL2)
- SSE error propagation in WebSearch emulation
- AccountStatsCost DTO field for admin usage logs
- Plans sort by sort_order instead of created_at
- UsageMapHook for streaming response usage data
- apicompat Instructions field passthrough
- EffectiveLoadFactor for ops concurrency/metrics
- Usage billing RETURNING balance for notify system
- BulkUpdate mixed channel warning with details
- println to slog migration in auth cache
- Wire ProviderSet cleanup
- CI cache-dependency-path optimization

Frontend:
- Refund eligibility check per provider (canRequestRefund)
- Plan sort_order editing
- Dead code cleanup (simulate_claude_max, client_affinity)
- GroupsView platform switch guard
- channels features_config API type
- UsageView account_stats_cost export

frontend/src/views/admin/GroupsView.vue

@@ -3253,6 +3253,7 @@ const editForm = reactive({
   fallback_group_id_on_invalid_request: null as number | null,
   // OpenAI Messages 调度配置（仅 openai 平台使用）
   allow_messages_dispatch: false,
+  default_mapped_model: '',
   opus_mapped_model: editMessagesDispatchDefaults.opus_mapped_model,
   sonnet_mapped_model: editMessagesDispatchDefaults.sonnet_mapped_model,
   haiku_mapped_model: editMessagesDispatchDefaults.haiku_mapped_model,
@@ -3732,6 +3733,19 @@ watch(
   },
 );
 
+watch(
+  () => editForm.platform,
+  (newVal) => {
+    if (!['anthropic', 'antigravity'].includes(newVal)) {
+      editForm.fallback_group_id_on_invalid_request = null
+    }
+    if (newVal !== 'openai') {
+      editForm.allow_messages_dispatch = false
+      editForm.default_mapped_model = ''
+    }
+  }
+)
+
 // 点击外部关闭账号搜索下拉框
 const handleClickOutside = (event: MouseEvent) => {
   const target = event.target as HTMLElement;

frontend/src/views/admin/UsageView.vue

@@ -495,7 +495,7 @@ const exportToExcel = async () => {
         log.cache_read_cost?.toFixed(6) || '0.000000', log.cache_creation_cost?.toFixed(6) || '0.000000',
         log.rate_multiplier?.toPrecision(4) || '1.00', (log.account_rate_multiplier ?? 1).toPrecision(4),
         log.total_cost?.toFixed(6) || '0.000000', log.actual_cost?.toFixed(6) || '0.000000',
-        (log.total_cost * (log.account_rate_multiplier ?? 1)).toFixed(6), log.first_token_ms ?? '', log.duration_ms,
+        ((log.account_stats_cost ?? log.total_cost) * (log.account_rate_multiplier ?? 1)).toFixed(6), log.first_token_ms ?? '', log.duration_ms,
         log.request_id || '', log.user_agent || '', log.ip_address || ''
       ])
       if (rows.length) {

frontend/src/views/admin/orders/AdminPaymentPlansView.vue

@@ -117,6 +117,7 @@ function getPlanNameClass(groupId: number): string {
   return group ? platformTextClass(group.platform) : 'text-gray-900 dark:text-white'
 }
 
+
 // ==================== Plans ====================
 
 const plansLoading = ref(false)
@@ -133,6 +134,7 @@ const planColumns = computed((): Column[] => [
   { key: 'price', label: t('payment.admin.price') },
   { key: 'validity_days', label: t('payment.admin.validityDays') },
   { key: 'for_sale', label: t('payment.admin.forSale') },
+  { key: 'sort_order', label: t('payment.admin.sortOrder') },
   { key: 'actions', label: t('common.actions') },
 ])
 
@@ -157,6 +159,7 @@ function openPlanEdit(plan: SubscriptionPlan | null) {
   showPlanDialog.value = true
 }
 
+
 /** Quick toggle for_sale from the list */
 async function toggleForSale(plan: SubscriptionPlan) {
   try {

frontend/src/views/admin/orders/PlanEditDialog.vue

@@ -42,6 +42,9 @@
         <div><label class="input-label">{{ t('payment.admin.validityDays') }} <span class="text-red-500">*</span></label><input v-model.number="planForm.validity_days" type="number" min="1" class="input" required /></div>
         <div><label class="input-label">{{ t('payment.admin.validityUnit') }} <span class="text-red-500">*</span></label><Select v-model="planForm.validity_unit" :options="validityUnitOptions" /></div>
       </div>
+      <div class="grid grid-cols-2 gap-4">
+        <div><label class="input-label">{{ t('payment.admin.sortOrder') }}</label><input v-model.number="planForm.sort_order" type="number" min="0" class="input" /></div>
+      </div>
       <div>
         <label class="input-label">{{ t('payment.admin.features') }}</label>
         <textarea v-model="planFeaturesText" rows="3" class="input" :placeholder="t('payment.admin.featuresPlaceholder')"></textarea>
@@ -102,7 +105,7 @@ const { t } = useI18n()
 const appStore = useAppStore()
 
 const saving = ref(false)
-const planForm = reactive({ name: '', group_id: null as number | null, description: '', price: 0, original_price: 0, validity_days: 30, validity_unit: 'days', for_sale: true })
+const planForm = reactive({ name: '', group_id: null as number | null, description: '', price: 0, original_price: 0, validity_days: 30, validity_unit: 'days', sort_order: 0, for_sale: true })
 const planFeaturesText = ref('')
 
 const validityUnitOptions = computed(() => [
@@ -130,10 +133,10 @@ const selectedGroupInfo = computed(() => {
 watch(() => props.show, (visible) => {
   if (!visible) return
   if (props.plan) {
-    Object.assign(planForm, { name: props.plan.name, group_id: props.plan.group_id, description: props.plan.description, price: props.plan.price, original_price: props.plan.original_price || 0, validity_days: props.plan.validity_days, validity_unit: props.plan.validity_unit || 'days', for_sale: props.plan.for_sale })
+    Object.assign(planForm, { name: props.plan.name, group_id: props.plan.group_id, description: props.plan.description, price: props.plan.price, original_price: props.plan.original_price || 0, validity_days: props.plan.validity_days, validity_unit: props.plan.validity_unit || 'days', sort_order: props.plan.sort_order || 0, for_sale: props.plan.for_sale })
     planFeaturesText.value = (props.plan.features || []).join('\n')
   } else {
-    Object.assign(planForm, { name: '', group_id: null, description: '', price: 0, original_price: 0, validity_days: 30, validity_unit: 'days', for_sale: true })
+    Object.assign(planForm, { name: '', group_id: null, description: '', price: 0, original_price: 0, validity_days: 30, validity_unit: 'days', sort_order: 0, for_sale: true })
     planFeaturesText.value = ''
   }
 })
@@ -149,6 +152,7 @@ function buildPlanPayload() {
     original_price: planForm.original_price || 0,
     validity_days: planForm.validity_days,
     validity_unit: planForm.validity_unit,
+    sort_order: planForm.sort_order,
     for_sale: planForm.for_sale,
     features,
   }