feat: 企微通讯录选人替换手填 userid（项目负责人/总群成员/群主合作方）

- wecom-client 新增 listInternalContacts：department/list + 逐部门 user/simplelist（cursor 翻页、去重、部门名映射）
- 新 action wecom_list_internal_contacts（仅返回应用可见范围内成员）
- admin 新增 WecomUserPickerModal：单选点行填入/多选勾选合并，姓名+userid 搜索，5 分钟共享缓存
- 三处接线：项目负责人（单选）、项目总群成员（多选合并去重）、新建群主合作方（单选）
- 拉取失败（60020 等）提示手填兜底，手填路径不变

app/api/action/route.ts

@@ -43,6 +43,7 @@ import {
   sendWecomAppMessage,
   sendWecomRobotMessage,
   listExternalContacts,
+  listInternalContacts,
   WecomClientError,
   type WecomBindings,
 } from "../../../lib/wecom-client";
@@ -683,6 +684,12 @@ export async function POST(request: Request) {
       );
       const contacts = await listExternalContacts(wecomConfig);
       return Response.json({ contacts });
+    } else if (body.action === "wecom_list_internal_contacts") {
+      const wecomConfig = resolveWecomConfig(
+        env as unknown as WecomBindings,
+      );
+      const contacts = await listInternalContacts(wecomConfig);
+      return Response.json({ contacts });
     } else if (body.action === "wecom_sync_group_chats") {
       const wecomConfig = resolveWecomConfig(
         env as unknown as WecomBindings,