refactor: 将退出登录功能从顶部导航栏移至设置面板

frontend/src/lib/i18n/en-US.ts

@@ -145,4 +145,8 @@ export const enUS: TranslationMap = {
   "auth.error.usernameLength": "Username must be 3-64 characters",
   "auth.error.passwordLength": "Password must be 8-72 characters",
   "auth.logout": "Sign Out",
+
+  // Account (in settings)
+  "settings.account": "Account",
+  "settings.account.user": "Current user",
 };

frontend/src/lib/i18n/ja-JP.ts

@@ -145,4 +145,8 @@ export const jaJP: TranslationMap = {
   "auth.error.usernameLength": "ユーザー名は3〜64文字で入力してください",
   "auth.error.passwordLength": "パスワードは8〜72文字で入力してください",
   "auth.logout": "ログアウト",
+
+  // Account (in settings)
+  "settings.account": "アカウント",
+  "settings.account.user": "現在のユーザー",
 };

frontend/src/lib/i18n/zh-CN.ts

@@ -145,4 +145,8 @@ export const zhCN: TranslationMap = {
   "auth.error.usernameLength": "用户名需要 3-64 个字符",
   "auth.error.passwordLength": "密码需要 8-72 个字符",
   "auth.logout": "退出登录",
+
+  // Account (in settings)
+  "settings.account": "账号",
+  "settings.account.user": "当前用户",
 };