fix(mobile): distinguish auth failure from HR mismatch on position sync page

问题:登录态失效(token 冻结/无效,后端返 401)时,同步岗位页把认证错误
误显示成「人力系统中未匹配到当前手机号的在职岗位,请联系 HR」,员工被
困在该页无路可退。

修复:
- api.ts: 新增 ApiError(statusCode/bizCode) 类型化错误与 isAuthApiError,
  readPayload/parsePayloadText/XHR 路径统一抛出带状态码的错误,消息不变
- position.ts: fetchOrgPositionResult 返回四态判别结果
  matched/unmatched/unauthorized/error;hydratePositionFromOrg 行为不变
- position/index.vue: 按四态分支处理——
  · unauthorized -> 清除登录态并自动回登录页(保留 redirect)
  · error -> 提示「网络异常…请重试」,保留重试按钮
  · unmatched -> 才显示联系 HR 文案
  并新增「退出重新登录」链接(确认弹窗后清登录态回登录页),
  避免任何异常场景下用户被困无退出路径

验证(构建产物 + 生产 API,Playwright 五场景全过,截图见
.data/visual-audit-20260718/position-fix/):
S1 固定码真实登录->今日页(保洁岗匹配) S2 无效token->自动回登录
S3 断网->网络异常提示留在本页 S4 有效token->自动通过
S5 退出链接->确认->回登录且登录态已清

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

mobile-uni/src/services/position.ts

@@ -1,5 +1,5 @@
 import type { MobileIdentity, RoleKey } from '@/types/api';
-import { apiRequest } from './api';
+import { apiRequest, isAuthApiError } from './api';
 import {
   clearOrgPosition,
   getSelectedPosition,
@@ -63,7 +63,13 @@ export const goToMobileTarget = (url: string) => {
   uni.redirectTo({ url });
 };
 
-export const hydratePositionFromOrg = async (): Promise<UserPosition | ''> => {
+export type OrgPositionResult =
+  | { status: 'matched'; position: UserPosition }
+  | { status: 'unmatched' }
+  | { status: 'unauthorized' }
+  | { status: 'error' };
+
+export const fetchOrgPositionResult = async (): Promise<OrgPositionResult> => {
   try {
     const identity = await apiRequest<MobileIdentity>({
       url: '/api/aihr/mobile/me',
@@ -72,13 +78,23 @@ export const hydratePositionFromOrg = async (): Promise<UserPosition | ''> => {
       clearAuthOnUnauthorized: false
     });
     const officialPosition = saveOrgPosition(identity.positionName);
-    if (!officialPosition) clearOrgPosition();
-    return officialPosition;
-  } catch {
-    return hasOrgPosition() ? getSelectedPosition() : '';
+    if (!officialPosition) {
+      clearOrgPosition();
+      return { status: 'unmatched' };
+    }
+    return { status: 'matched', position: officialPosition };
+  } catch (error) {
+    return { status: isAuthApiError(error) ? 'unauthorized' : 'error' };
   }
 };
 
+export const hydratePositionFromOrg = async (): Promise<UserPosition | ''> => {
+  const result = await fetchOrgPositionResult();
+  if (result.status === 'matched') return result.position;
+  if (result.status === 'unmatched') return '';
+  return hasOrgPosition() ? getSelectedPosition() : '';
+};
+
 export const nextUserRouteAfterLogin = async (redirect: string) => {
   const role = await hydrateMobileRole();
   const roleRoute = routeForMobileRole(role, redirect);