fix(platform): constrain delivery account role

frontend/platform_admin/src/views/shared/CrudListPage.vue

@@ -152,7 +152,9 @@
         <a-input v-model="accountForm.display_name" />
       </a-form-item>
       <a-form-item label="角色编码">
-        <a-input v-model="accountForm.role_code" />
+        <!-- 配送点后台当前仅支持 admin，其他账户资源仍保留原有输入方式。 -->
+        <a-input v-if="definition.accountManagement?.resource !== '/delivery_account'" v-model="accountForm.role_code" />
+        <a-input v-else model-value="配送点管理员" disabled />
       </a-form-item>
     </a-form>
   </a-modal>
@@ -674,10 +676,12 @@ async function loadManagedAccounts() {
 }
 
 function resetAccountForm(row?: Row) {
+  // 配送点账户使用服务端唯一支持的管理员角色，避免生成无法登录的账号。
+  const fixedRoleCode = props.definition.accountManagement?.resource === '/delivery_account' ? 'admin' : undefined;
   accountForm.username = row?.username ?? '';
   accountForm.password = '';
   accountForm.display_name = row?.display_name ?? '';
-  accountForm.role_code = row?.role_code ?? '';
+  accountForm.role_code = fixedRoleCode ?? row?.role_code ?? '';
 }
 
 function openAccountCreate() {
@@ -712,7 +716,7 @@ async function saveAccount() {
   try {
     const payload: Record<string, unknown> = {
       display_name: String(accountForm.display_name ?? '').trim(),
-      role_code: String(accountForm.role_code ?? '').trim(),
+      role_code: management.resource === '/delivery_account' ? 'admin' : String(accountForm.role_code ?? '').trim(),
       [management.relationKey]: ownerIdentity,
     };
     if (!accountEditingIdentity.value) {