fix: 修复登录重复创建会话 + 备注输入框不可交互

- login.js 增加防重复提交锁，请求期间禁用按钮
- Manager.Create 增加幂等检查，同用户同IP同UA 10秒内复用已有会话
- 移除当前设备备注输入框的 readonly 限制，改为 data-current 标记
- 修复 readonly 状态下输入框完全透明无法点击的问题

templates/MetaLab-2026/static/js/login.js

@@ -55,7 +55,14 @@
         doLogin(email, password);
     });
 
+    var loginInProgress = false;
+
     function doLogin(email, password) {
+        if (loginInProgress) return;
+        loginInProgress = true;
+        submitBtn.disabled = true;
+        submitBtn.textContent = '登录中...';
+
         var xhr = new XMLHttpRequest();
         xhr.open('POST', '/api/auth/login', true);
         xhr.setRequestHeader('Content-Type', 'application/json');
@@ -65,7 +72,9 @@
                 try { resp = JSON.parse(xhr.responseText); } catch (err) { resp = null; }
 
                 if (xhr.status === 200 && resp && resp.success && resp.action === 'confirm_restore') {
-                    // 注销账号登录 → 二次确认恢复
+                    loginInProgress = false;
+                    submitBtn.disabled = false;
+                    submitBtn.textContent = '登录';
                     if (confirm(resp.message + '\n\n确认继续登录将中止注销流程。')) {
                         doConfirmRestore(email, password);
                     }
@@ -75,6 +84,9 @@
                         window.location.href = '/';
                     }, 800);
                 } else {
+                    loginInProgress = false;
+                    submitBtn.disabled = false;
+                    submitBtn.textContent = '登录';
                     var msg = (resp && resp.message) ? resp.message : '登录失败，请稍后重试';
                     window.MetaLab.toast(toast, msg, true);
                 }
@@ -84,6 +96,11 @@
     }
 
     function doConfirmRestore(email, password) {
+        if (loginInProgress) return;
+        loginInProgress = true;
+        submitBtn.disabled = true;
+        submitBtn.textContent = '恢复中...';
+
         var xhr = new XMLHttpRequest();
         xhr.open('POST', '/api/auth/confirm-restore', true);
         xhr.setRequestHeader('Content-Type', 'application/json');
@@ -98,6 +115,9 @@
                         window.location.href = '/';
                     }, 800);
                 } else {
+                    loginInProgress = false;
+                    submitBtn.disabled = false;
+                    submitBtn.textContent = '登录';
                     var msg = (resp && resp.message) ? resp.message : '操作失败，请稍后重试';
                     window.MetaLab.toast(toast, msg, true);
                 }