新增用户注册功能

frontend/src/utils/auth.ts

@@ -1,4 +1,5 @@
 const TOKEN_KEY = "ctms_token";
+const CREDENTIAL_KEY = "ctms_credential";
 
 export const getToken = (): string | null => localStorage.getItem(TOKEN_KEY);
 
@@ -9,3 +10,30 @@ export const setToken = (token: string): void => {
 export const clearToken = (): void => {
   localStorage.removeItem(TOKEN_KEY);
 };
+
+export const setCachedCredential = (email: string, password: string) => {
+  try {
+    const payload = btoa(JSON.stringify({ email, password }));
+    localStorage.setItem(CREDENTIAL_KEY, payload);
+  } catch {
+    /* ignore */
+  }
+};
+
+export const getCachedCredential = (): { email: string; password: string } | null => {
+  const value = localStorage.getItem(CREDENTIAL_KEY);
+  if (!value) return null;
+  try {
+    const parsed = JSON.parse(atob(value));
+    if (parsed?.email && parsed?.password) {
+      return { email: parsed.email, password: parsed.password };
+    }
+  } catch {
+    /* ignore */
+  }
+  return null;
+};
+
+export const clearCachedCredential = (): void => {
+  localStorage.removeItem(CREDENTIAL_KEY);
+};