docs(audit): 14 页 API 契约审计与凭据轮询 SSOT 收尾

记录凭据轮询/pending 契约对照与生产验证，更新功能指南与附录 J，并将 pending 相关类型集中到 api.ts。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/pages/ServersPage.vue

@@ -343,7 +343,7 @@ import { http } from '@/api'
 import { useSnackbar } from '@/composables/useSnackbar'
 import { useServerPagination } from '@/composables/useServerPagination'
 import { statusChipColor, statusLabel, formatRelativeTime } from '@/utils/status'
-import type { ServerApiItem } from '@/types/api'
+import type { AddByIpResponse, PendingServerItem, PollErrorItem, ServerApiItem } from '@/types/api'
 import { normalizeServerIds, countBatchSuccess, type BatchAgentResultItem } from '@/utils/serverSelection'
 import { formatApiError } from '@/utils/apiError'
 import StatCardsRow from '@/components/StatCardsRow.vue'
@@ -372,33 +372,6 @@ const deleting = ref(false)
 const deletingServer = ref<ServerApiItem | null>(null)
 
 // ── Quick add by IP + pending failure list ──
-interface PollErrorItem {
-  preset_type: string
-  preset_name: string
-  username: string
-  error: string
-}
-
-interface PendingServerItem {
-  id: number
-  name: string
-  domain: string
-  port: number
-  attempts: number
-  last_error: string
-  last_attempt_at: string | null
-}
-
-interface AddByIpResponse {
-  success: boolean
-  server?: ServerApiItem
-  pending_id?: number
-  errors?: PollErrorItem[]
-  message?: string
-  matched_preset?: string
-  matched_username?: string
-}
-
 const showQuickAdd = ref(false)
 const quickAddLoading = ref(false)
 const quickAddForm = ref({ domain: '', port: 22, name: '' })