fix: 移除后台登录默认凭据

ai_knowledge_base_v2/apps/admin-web/src/App.vue

@@ -21,7 +21,7 @@ const admin = ref<AdminProfile | null>(null);
 const activeMenu = ref("dashboard");
 const loading = ref(false);
 
-const loginForm = reactive({ username: "admin", password: "admin123456" });
+const loginForm = reactive({ username: "", password: "" });
 const stats = ref<DashboardStats | null>(null);
 const dashboardFilters = reactive({
   start: "",
@@ -1068,9 +1068,9 @@ function formatRecordDateTime(value: string, boundary: "start" | "end") {
           <h2>登录答疑后台</h2>
           <p>请输入大本营答疑助手后台管理员账号和密码。</p>
         </div>
-        <el-form label-position="top" @submit.prevent="login">
+        <el-form label-position="top" autocomplete="off" @submit.prevent="login">
           <el-form-item label="管理员账号">
-            <el-input v-model="loginForm.username" size="large" placeholder="请输入管理员账号" />
+            <el-input v-model="loginForm.username" size="large" placeholder="请输入管理员账号" autocomplete="off" />
           </el-form-item>
           <el-form-item label="密码">
             <el-input
@@ -1078,6 +1078,7 @@ function formatRecordDateTime(value: string, boundary: "start" | "end") {
               size="large"
               type="password"
               placeholder="请输入密码"
+              autocomplete="new-password"
               show-password
             />
           </el-form-item>