feat: add token validation api and auth module

open-isle-cli/src/utils/auth.js

@@ -0,0 +1,28 @@
+import { API_BASE_URL } from '../main'
+
+const TOKEN_KEY = 'token'
+
+export function getToken() {
+  return localStorage.getItem(TOKEN_KEY)
+}
+
+export function setToken(token) {
+  localStorage.setItem(TOKEN_KEY, token)
+}
+
+export function clearToken() {
+  localStorage.removeItem(TOKEN_KEY)
+}
+
+export async function checkToken() {
+  const token = getToken()
+  if (!token) return false
+  try {
+    const res = await fetch(`${API_BASE_URL}/api/auth/check`, {
+      headers: { Authorization: `Bearer ${token}` }
+    })
+    return res.ok
+  } catch (e) {
+    return false
+  }
+}