feat: 添加用户会话管理功能，包括登录状态、用户名计算和会话初始化

frontend/portal/src/service/auth.js

@@ -1,4 +1,5 @@
-import { requestJson, setPortalAuthToken } from './apiClient';
+import { requestJson } from './apiClient';
+import { setTokenAndLoadMe } from './session';
 
 export async function register({ username, password, confirmPassword, verifyCode }) {
     const data = await requestJson('/v1/auth/register', {
@@ -6,7 +7,6 @@ export async function register({ username, password, confirmPassword, verifyCode
         body: { username, password, confirmPassword, verifyCode }
     });
     const token = data?.token ?? '';
-    if (token) setPortalAuthToken(token);
+    if (token) await setTokenAndLoadMe(token);
     return token;
 }
-