fix: 移除前端 API 环境入口

frontend/src/api/axios.ts

@@ -7,12 +7,9 @@ import { useStudyStore } from "../store/study";
 import { TEXT } from "../locales";
 import { extendAccessToken, forceLogout, lockSession, markNetworkActive } from "../session/sessionManager";
 import { useSessionStore } from "../store/session";
-import { resolveApiBaseUrl } from "./baseUrl";
-
-const apiBaseUrl = resolveApiBaseUrl(import.meta.env.VITE_API_BASE_URL);
 
 const instance: AxiosInstance = axios.create({
-  baseURL: apiBaseUrl,
+  baseURL: "/",
   timeout: 15000,
 });