feat: 更新超级管理员登录逻辑，添加路由守卫和用户统计功能

frontend/superadmin/src/service/auth.js

@@ -0,0 +1,42 @@
+import { requestJson } from './apiClient';
+
+const SUPER_TOKEN_KEY = 'super_token';
+
+export function getSuperAuthToken() {
+    return localStorage.getItem(SUPER_TOKEN_KEY) || '';
+}
+
+export function setSuperAuthToken(token) {
+    const normalized = String(token || '').trim();
+    if (!normalized) {
+        localStorage.removeItem(SUPER_TOKEN_KEY);
+        return;
+    }
+    localStorage.setItem(SUPER_TOKEN_KEY, normalized);
+}
+
+export function clearSuperAuthToken() {
+    localStorage.removeItem(SUPER_TOKEN_KEY);
+}
+
+export function hasSuperAuthToken() {
+    return Boolean(getSuperAuthToken());
+}
+
+export async function superLogin({ username, password }) {
+    const data = await requestJson('/super/v1/auth/login', {
+        method: 'POST',
+        body: { username, password }
+    });
+    const token = data?.token ?? '';
+    setSuperAuthToken(token);
+    return token;
+}
+
+export async function refreshSuperToken() {
+    const data = await requestJson('/super/v1/auth/token');
+    const token = data?.token ?? '';
+    if (token) setSuperAuthToken(token);
+    return token;
+}
+