task-93(店铺中心): 实现店铺凭证字段分离

新增 shop-credential-model.ts：凭证明文仅经凭证端点解码且落 SensitiveString，
与列表行(仅掩码)字段分离；shop-manage-api.ts 增加 fetchShopCredential
(GET /api/admin/shop-manages/{id}/credential?shop_name=…)。

TDD: task-93.test.ts 8 用例先 RED 后 GREEN。

admin-frontend-vue/src/pages/shop/shop-credential-model.ts

@@ -0,0 +1,42 @@
+/** 店铺明文凭据解析模型（任务 93）：凭证明文仅来自凭证端点且落 SensitiveString，
+ * 与列表行(仅掩码)字段分离；纯逻辑。 */
+import { unwrap } from '../../api/envelope.ts'
+import { toSensitiveString, type ShopCredential } from './shop-dto.ts'
+
+function text(value: unknown): string {
+  return typeof value === 'string' ? value.trim() : ''
+}
+
+function numberOrNull(value: unknown): number | null {
+  return typeof value === 'number' && Number.isFinite(value) ? Math.floor(value) : null
+}
+
+/** 解析单条明文凭据；缺 id 或密码为空视为无效(拒绝把空当明文)。 */
+export function toShopCredential(raw: unknown): ShopCredential | null {
+  if (!raw || typeof raw !== 'object') return null
+  const record = raw as Record<string, unknown>
+  const id = numberOrNull(record.id)
+  if (id === null) return null
+  const password = text(record.password)
+  if (!password) return null
+  const credential: ShopCredential = {
+    id,
+    groupId: numberOrNull(record.groupId ?? record.group_id),
+    groupName: text(record.groupName ?? record.group_name),
+    shopName: text(record.shopName ?? record.shop_name),
+    mallName: text(record.mallName ?? record.mall_name),
+    znUsername: text(record.znUsername ?? record.zn_username),
+    account: text(record.account),
+    password: toSensitiveString(password),
+  }
+  return credential
+}
+
+/** 解包凭证端点负载(data 为 ShopManageCredentialVo)为明文凭据；无效时抛可操作错误。 */
+export function parseShopCredential(payload: unknown): ShopCredential {
+  const credential = toShopCredential(unwrap<unknown>(payload))
+  if (!credential) {
+    throw new Error('读取店铺凭证响应异常：未返回有效的明文凭据')
+  }
+  return credential
+}

admin-frontend-vue/src/pages/shop/shop-manage-api.ts

@@ -1,11 +1,13 @@
-/** 店铺列表/分组/新增适配（任务 88/90/91）：GET|POST /api/admin/shop-manages + 归一与解析。 */
+/** 店铺列表/分组/新增/编辑/凭证适配（任务 88-93）：/api/admin/shop-manages 系端点 + 归一与解析。 */
 import { http } from '@/api/http'
 import { unwrap } from '@/api/envelope'
 import { parseShopManagePage, toShopSummary } from './shop-manage-model.ts'
 import { parseShopManageGroups } from './shop-group-model.ts'
+import { toShopCredential } from './shop-credential-model.ts'
 import {
   normalizeShopListParams,
   toShopManagePageQuery,
+  type ShopCredential,
   type ShopGroupOption,
   type ShopManageListParams,
   type ShopPageResult,
@@ -61,3 +63,13 @@ export async function submitUpdateShopManage(id: number, form: ShopManageFormVal
   }
   return item
 }
+
+/** 读取店铺明文凭据：GET /api/admin/shop-manages/{id}/credential?shop_name=…；明文仅在内存短时使用。 */
+export async function fetchShopCredential(id: number, shopName: string): Promise<ShopCredential> {
+  const { data } = await http.get<unknown>(`${SHOP_MANAGE_ENDPOINT}/${id}/credential`, { params: { shop_name: shopName } })
+  const credential = toShopCredential(unwrap<unknown>(data))
+  if (!credential) {
+    throw new Error('读取店铺凭证响应异常：未返回有效记录')
+  }
+  return credential
+}