chore: 更新.gitignore并移除注释代码

更新.gitignore文件，添加对alembic版本目录的忽略
移除前端LockDialog和LockPage组件中的注释代码

frontend/src/layouts/components/NavBar/components/LockDialog.vue

@@ -8,7 +8,6 @@
   >
     <div class="lock-dialog-content">
       <!-- 头像 -->
-      <!-- <img src="@/assets/logo.png" alt="" class="lock-dialog-avatar" /> -->
       <img :src="userStore.basicInfo.avatar" alt="" class="lock-dialog-avatar" />
       <!-- 用户名 -->
       <!-- <span class="lock-dialog-name">{{ t('navbar.lock') }}</span> -->

frontend/src/layouts/components/NavBar/components/LockPage.vue

@@ -23,7 +23,6 @@
       <div v-show="!showDate" class="entry-wrapper">
         <div class="entry-content">
           <div class="avatar-container">
-            <!-- <img src="@/assets/logo.png" alt="" class="avatar" /> -->
             <img :src="userStore.basicInfo.avatar" alt="" class="avatar" />
             <span class="username">{{ userStore.basicInfo.name }}</span>
           </div>