refactor(account): 로그인 상태 필드 정리 및 role 저장

왜: userId/nickname/profileImage는 사용처가 없어 유지보수 단순화. 대신 권한 판별을 위해 role 필요.\n무엇: accountStore에서 세 필드 삭제, role 추가. isAuthenticated 동기화 수정. LOGIN/LOGOUT 로직 role 반영. Axios Authorization 유지.

src/store/accountStore.js

@@ -12,17 +12,13 @@ enhanceAccessToken();
 const accountStore = {
     namespaced: true,
     state: {
-        userId: '',
-        nickname: '',
         accessToken: '',
-        profileImage: '',
+        role: '',
     },
     getters: {
         isAuthenticated(state) {
-            state.userId = state.userId || localStorage.userId
-            state.nickname = state.nickname || localStorage.nickname
-            state.profileImage = state.profileImage || localStorage.profileImage
             state.accessToken = state.accessToken || localStorage.accessToken
+            state.role = state.role || localStorage.role
 
             return state.accessToken !== undefined &&
                 state.accessToken !== null &&
@@ -31,27 +27,19 @@ const accountStore = {
         }
     },
     mutations: {
-        LOGIN(state, {userId, nickname, token, profileImage}) {
-            state.userId = userId
-            localStorage.userId = userId
-
-            state.nickname = nickname
-            localStorage.nickname = nickname
-
-            state.profileImage = profileImage
-            localStorage.profileImage = profileImage
-
+        LOGIN(state, {token, role}) {
             state.accessToken = token
             localStorage.accessToken = token
 
+            state.role = role
+            localStorage.role = role
+
             Vue.axios.defaults.headers.common['Authorization'] = `Bearer ${token}`;
         },
 
         LOGOUT(state) {
-            state.userId = ''
-            state.nickname = ''
-            state.profileImage = ''
             state.accessToken = ''
+            state.role = ''
 
             localStorage.clear()
             if (location.pathname === '/') {