修复了一些已知问题

frontend/admin/students.php

@@ -184,6 +184,7 @@ async function loadStudents(page = 1) {
                     <button class="btn btn-sm btn-primary" onclick="showSinglePointsModal(${student.student_id}, '${escapeHtml(student.name)}')">加减分</button>
                     ${userRole === '班主任' ? `<button class="btn btn-sm btn-secondary" onclick="showEditStudentModal(${student.student_id}, '${escapeHtml(student.student_no)}', '${escapeHtml(student.name)}', '${escapeHtml(student.parent_phone || '')}')">编辑</button>
                     <button class="btn btn-sm btn-warning" onclick="showResetStudentPasswordModal(${student.student_id}, '${escapeHtml(student.name)}')">重置密码</button>
+                    <button class="btn btn-sm btn-info" onclick="unlockStudent('${escapeHtml(student.student_no)}', '${escapeHtml(student.name)}')">解锁</button>
                     <button class="btn btn-sm btn-danger" onclick="deleteStudent(${student.student_id}, '${escapeHtml(student.name)}')">删除</button>` : ''}
                 </td>
             </tr>`;
@@ -223,6 +224,23 @@ function toggleSelectAll() {
     }
 }
 
+// 解锁学生登录
+async function unlockStudent(studentNo, studentName) {
+    if (!confirm(`确定要解除学生 "${studentName}" 的登录锁定吗？\n（适用于多次登录失败被禁止登录的情况）`)) {
+        return;
+    }
+    
+    const res = await apiPost('/api/admin/unlock-user', {
+        username: studentNo
+    });
+    
+    if (res && res.success) {
+        showToast(res.message || '解锁成功');
+    } else {
+        showToast(res?.message || '解锁失败', 'error');
+    }
+}
+
 // 页面加载
 loadStudents();