chore(channels): drop admin-side available channels view

Remove the admin-side "Available Channels" aggregate view — admins
already see full channel configuration (groups, pricing, model
mappings) in the channel edit dialog, making a read-only admin
aggregate view redundant. The user-side "可用渠道" remains.

Backend:
- Delete handler/admin/available_channel_handler.go (+ test)
- Drop AdminHandlers.AvailableChannel field and wire injection
- Remove /admin/channels/available route

Frontend:
- Delete views/admin/AvailableChannelsView.vue
- Drop /admin/available-channels router entry
- Strip AvailableChannel types + listAvailable from api/admin/channels.ts

frontend/src/api/admin/channels.ts

@@ -164,42 +164,5 @@ export async function getModelDefaultPricing(model: string): Promise<ModelDefaul
   return data
 }
 
-// --- Available channels (聚合视图：渠道 + 分组 + 支持模型) ---
-
-export interface AvailableGroupRef {
-  id: number
-  name: string
-  platform: string
-}
-
-export interface SupportedModel {
-  name: string
-  platform: string
-  pricing: ChannelModelPricing | null
-}
-
-export interface AvailableChannel {
-  id: number
-  name: string
-  description: string
-  status: ChannelStatus
-  billing_model_source: BillingModelSource
-  restrict_models: boolean
-  groups: AvailableGroupRef[]
-  supported_models: SupportedModel[]
-}
-
-interface AvailableChannelsResponse {
-  items: AvailableChannel[]
-}
-
-/** 列出所有可用渠道（含关联分组与支持模型） */
-export async function listAvailable(options?: { signal?: AbortSignal }): Promise<AvailableChannel[]> {
-  const { data } = await apiClient.get<AvailableChannelsResponse>('/admin/channels/available', {
-    signal: options?.signal
-  })
-  return data.items
-}
-
-const channelsAPI = { list, getById, create, update, remove, getModelDefaultPricing, listAvailable }
+const channelsAPI = { list, getById, create, update, remove, getModelDefaultPricing }
 export default channelsAPI

frontend/src/router/index.ts

@@ -370,18 +370,6 @@ const routes: RouteRecordRaw[] = [
       descriptionKey: 'admin.groups.description'
     }
   },
-  {
-    path: '/admin/available-channels',
-    name: 'AdminAvailableChannels',
-    component: () => import('@/views/admin/AvailableChannelsView.vue'),
-    meta: {
-      requiresAuth: true,
-      requiresAdmin: true,
-      title: 'Available Channels',
-      titleKey: 'admin.availableChannels.title',
-      descriptionKey: 'admin.availableChannels.description'
-    }
-  },
   {
     path: '/admin/channels',
     redirect: '/admin/channels/pricing'

frontend/src/views/admin/AvailableChannelsView.vue

@@ -1,164 +0,0 @@
-<template>
-  <AppLayout>
-    <TablePageLayout>
-      <template #filters>
-        <div class="flex flex-col justify-between gap-4 lg:flex-row lg:items-start">
-          <div class="flex flex-1 flex-wrap items-center gap-3">
-            <div class="relative w-full sm:w-80">
-              <Icon
-                name="search"
-                size="md"
-                class="absolute left-3 top-1/2 -translate-y-1/2 text-gray-400 dark:text-gray-500"
-              />
-              <input
-                v-model="searchQuery"
-                type="text"
-                :placeholder="t('admin.availableChannels.searchPlaceholder')"
-                class="input pl-10"
-              />
-            </div>
-          </div>
-
-          <div class="flex w-full flex-shrink-0 flex-wrap items-center justify-end gap-3 lg:w-auto">
-            <button
-              @click="loadChannels"
-              :disabled="loading"
-              class="btn btn-secondary"
-              :title="t('common.refresh', 'Refresh')"
-            >
-              <Icon name="refresh" size="md" :class="loading ? 'animate-spin' : ''" />
-            </button>
-          </div>
-        </div>
-      </template>
-
-      <template #table>
-        <AvailableChannelsTable
-          :columns="columns"
-          :rows="filteredChannels"
-          :loading="loading"
-          pricing-key-prefix="admin.availableChannels.pricing"
-          :no-pricing-label="t('admin.availableChannels.noPricing')"
-          :no-models-label="t('admin.availableChannels.noModels')"
-          :empty-label="t('admin.availableChannels.empty')"
-        >
-          <template #empty-groups>{{ t('admin.availableChannels.noGroups') }}</template>
-
-          <template #cell-status="{ row }">
-            <span
-              :class="statusStyleOf(row.status).cls"
-              class="inline-flex items-center rounded px-2 py-0.5 text-xs font-medium"
-            >
-              {{ statusStyleOf(row.status).label }}
-            </span>
-          </template>
-
-          <template #cell-billing_model_source="{ row }">
-            <span class="text-xs text-gray-700 dark:text-gray-300">
-              {{ billingSourceLabelOf(row.billing_model_source) }}
-            </span>
-          </template>
-        </AvailableChannelsTable>
-      </template>
-    </TablePageLayout>
-  </AppLayout>
-</template>
-
-<script setup lang="ts">
-import { computed, onMounted, ref } from 'vue'
-import { useI18n } from 'vue-i18n'
-import AppLayout from '@/components/layout/AppLayout.vue'
-import TablePageLayout from '@/components/layout/TablePageLayout.vue'
-import Icon from '@/components/icons/Icon.vue'
-import AvailableChannelsTable from '@/components/channels/AvailableChannelsTable.vue'
-import channelsAPI, { type AvailableChannel } from '@/api/admin/channels'
-import { useAppStore } from '@/stores/app'
-import { extractApiErrorMessage } from '@/utils/apiError'
-import {
-  CHANNEL_STATUS_ACTIVE,
-  CHANNEL_STATUS_DISABLED,
-  BILLING_MODEL_SOURCE_REQUESTED,
-  BILLING_MODEL_SOURCE_UPSTREAM,
-  BILLING_MODEL_SOURCE_CHANNEL_MAPPED,
-  type ChannelStatus,
-  type BillingModelSource
-} from '@/constants/channel'
-
-const { t } = useI18n()
-const appStore = useAppStore()
-
-const channels = ref<AvailableChannel[]>([])
-const loading = ref(false)
-const searchQuery = ref('')
-
-const columns = computed(() => [
-  { key: 'name', label: t('admin.availableChannels.columns.name') },
-  { key: 'status', label: t('admin.availableChannels.columns.status') },
-  { key: 'billing_model_source', label: t('admin.availableChannels.columns.billingSource') },
-  { key: 'groups', label: t('admin.availableChannels.columns.groups') },
-  { key: 'supported_models', label: t('admin.availableChannels.columns.supportedModels') }
-])
-
-/**
- * 显示样式：i18n label + Tailwind class，按 ChannelStatus 完整穷举。
- * Record 键类型强制未来新增 ChannelStatus 成员时 TS 编译失败，避免遗漏分支。
- */
-const statusStyles = computed<Record<ChannelStatus, { label: string; cls: string }>>(() => ({
-  [CHANNEL_STATUS_ACTIVE]: {
-    label: t('admin.availableChannels.statusActive'),
-    cls: 'bg-green-100 text-green-800 dark:bg-green-900/30 dark:text-green-400'
-  },
-  [CHANNEL_STATUS_DISABLED]: {
-    label: t('admin.availableChannels.statusDisabled'),
-    cls: 'bg-gray-100 text-gray-600 dark:bg-dark-700 dark:text-gray-400'
-  }
-}))
-
-/**
- * BillingModelSource 显式映射：避免将后端 snake_case 字面量直接拼成 i18n key，
- * 同时在 BillingModelSource 扩展时 TS 编译失败以暴露遗漏。
- */
-const billingSourceLabels = computed<Record<BillingModelSource, string>>(() => ({
-  [BILLING_MODEL_SOURCE_REQUESTED]: t('admin.availableChannels.billingSource.requested'),
-  [BILLING_MODEL_SOURCE_UPSTREAM]: t('admin.availableChannels.billingSource.upstream'),
-  [BILLING_MODEL_SOURCE_CHANNEL_MAPPED]: t('admin.availableChannels.billingSource.channel_mapped')
-}))
-
-// 运行时兜底：即便 service 层归一化漏点或后端新增未同步的 enum 值传入，
-// 也不会触发 undefined.cls 崩溃；统一降级为 "-"。
-const DEFAULT_STATUS_STYLE = { label: '-', cls: '' }
-const DEFAULT_BILLING_LABEL = '-'
-
-function statusStyleOf(status: ChannelStatus | undefined): { label: string; cls: string } {
-  return status ? statusStyles.value[status] : DEFAULT_STATUS_STYLE
-}
-
-function billingSourceLabelOf(src: BillingModelSource | undefined): string {
-  return src ? billingSourceLabels.value[src] : DEFAULT_BILLING_LABEL
-}
-
-const filteredChannels = computed(() => {
-  const q = searchQuery.value.trim().toLowerCase()
-  if (!q) return channels.value
-  return channels.value.filter((ch) => {
-    if (ch.name.toLowerCase().includes(q)) return true
-    if ((ch.description || '').toLowerCase().includes(q)) return true
-    if (ch.groups.some((g) => g.name.toLowerCase().includes(q))) return true
-    if (ch.supported_models.some((m) => m.name.toLowerCase().includes(q))) return true
-    return false
-  })
-})
-
-async function loadChannels() {
-  loading.value = true
-  try {
-    channels.value = await channelsAPI.listAvailable()
-  } catch (err: unknown) {
-    appStore.showError(extractApiErrorMessage(err, t('common.error')))
-  } finally {
-    loading.value = false
-  }
-}
-
-onMounted(loadChannels)
-</script>