feat: 支持按键分离事件与键盘捕获，并优化UI

- 后端与前端新增 keyAction 参数，支持按键按下/抬起独立事件，保持向下兼容
- 前端控制栏支持 pointerdown/pointerup 长按，新增键盘捕获输入框，映射浏览器按键到 Android KeyEvent
- 重构顶栏布局：用户区右置并添加在线指示器、状态文本省略，优化窄屏响应式表现
- 控制栏录制按钮组防拆行，分辨率/帧率选择器自适应收缩，全局样式增强
- 修复 AdminAuthFilter 中 doFilter 被异常捕获导致误返回 401 的问题
- 移除管理后台中用户 admin 角色及相关 UI 与 API
- 更新信令前端环境代理地址，修正路由名称大小写

WebRTCSignalServerWeb/src/views/users/UserList.vue

@@ -31,9 +31,6 @@
         <el-table-column prop="username" label="用户名" min-width="150">
           <template #default="{ row }">
             <span class="link-user" @click="openBindings(row)">{{ row.username }}</span>
-            <el-tag v-if="row.admin" type="danger" size="small" style="margin-left: 6px">
-              管理员
-            </el-tag>
             <el-tag v-if="row.deviceCount > 0" type="info" size="small" style="margin-left: 6px">
               {{ row.deviceCount }} 台设备
             </el-tag>
@@ -96,9 +93,6 @@
                   <el-dropdown-item command="bindings">查看绑定设备</el-dropdown-item>
                   <el-dropdown-item command="sessions">查看会话</el-dropdown-item>
                   <el-dropdown-item command="reset">重置密码</el-dropdown-item>
-                  <el-dropdown-item command="admin">
-                    {{ row.admin ? '取消管理员' : '设为管理员' }}
-                  </el-dropdown-item>
                   <el-dropdown-item command="delete" divided>删除账号</el-dropdown-item>
                 </el-dropdown-menu>
               </template>
@@ -118,9 +112,6 @@
         <el-form-item label="密码" prop="password">
           <el-input v-model="createForm.password" type="password" show-password />
         </el-form-item>
-        <el-form-item label="管理员">
-          <el-switch v-model="createForm.admin" />
-        </el-form-item>
       </el-form>
       <template #footer>
         <el-button @click="createVisible = false">取消</el-button>
@@ -211,7 +202,6 @@ import {
   createUser,
   deleteUser,
   resetUserPassword,
-  setUserAdmin,
   banUser,
   unbanUser,
   kickUser,
@@ -249,7 +239,7 @@ watch(statusFilter, load);
 // ---------- 添加用户 ----------
 const createVisible = ref(false);
 const createFormRef = ref<FormInstance>();
-const createForm = ref({ username: '', password: '', admin: false });
+const createForm = ref({ username: '', password: '' });
 const createRules: FormRules = {
   username: [
     { required: true, message: '请输入用户名', trigger: 'blur' },
@@ -262,7 +252,7 @@ const createRules: FormRules = {
 };
 
 function openCreate() {
-  createForm.value = { username: '', password: '', admin: false };
+  createForm.value = { username: '', password: '' };
   createVisible.value = true;
 }
 
@@ -328,19 +318,6 @@ async function handleDelete(row: UserAccountView) {
   await load();
 }
 
-async function handleToggleAdmin(row: UserAccountView) {
-  const next = !row.admin;
-  const ok = await ElMessageBox.confirm(
-    `确定${next ? '授予' : '取消'}「${row.username}」的管理员权限？`,
-    '权限调整',
-    { type: 'warning', confirmButtonText: '确定', cancelButtonText: '取消' },
-  ).catch(() => false);
-  if (!ok) return;
-  await setUserAdmin(row.userId, next);
-  ElMessage.success('权限已更新');
-  await load();
-}
-
 // ---------- 重置密码 ----------
 const resetVisible = ref(false);
 const newPassword = ref('');
@@ -366,6 +343,9 @@ async function submitReset() {
     } else {
       ElMessage.error(resp.message || '重置失败');
     }
+  } catch {
+    // 错误提示已由 request 响应拦截器统一弹出，这里仅吞掉异常，
+    // 避免未捕获的 Promise rejection，并保证弹窗保持打开以便重试。
   } finally {
     submitting.value = false;
   }
@@ -418,7 +398,6 @@ function handleCommand(cmd: string, row: UserAccountView) {
   if (cmd === 'bindings') openBindings(row);
   else if (cmd === 'sessions') openSessions(row);
   else if (cmd === 'reset') openReset(row);
-  else if (cmd === 'admin') handleToggleAdmin(row);
   else if (cmd === 'delete') handleDelete(row);
 }