Step F1：前端工程骨架 & 登录鉴权

frontend/src/utils/auth.ts

@@ -0,0 +1,11 @@
+const TOKEN_KEY = "ctms_token";
+
+export const getToken = (): string | null => localStorage.getItem(TOKEN_KEY);
+
+export const setToken = (token: string): void => {
+  localStorage.setItem(TOKEN_KEY, token);
+};
+
+export const clearToken = (): void => {
+  localStorage.removeItem(TOKEN_KEY);
+};