Step F2：项目列表 & 当前项目上下文

frontend/src/store/auth.ts

@@ -3,6 +3,7 @@ import { ref } from "vue";
 import { login as apiLogin, fetchMe } from "../api/auth";
 import { setToken, clearToken, getToken } from "../utils/auth";
 import type { UserInfo } from "../types/api";
+import { useStudyStore } from "./study";
 
 export const useAuthStore = defineStore("auth", () => {
   const token = ref<string | null>(getToken());
@@ -31,6 +32,8 @@ export const useAuthStore = defineStore("auth", () => {
     token.value = null;
     user.value = null;
     clearToken();
+    const studyStore = useStudyStore();
+    studyStore.clearCurrentStudy();
   };
 
   return {