feat: add unbind and delete device actions to admin portal

@@ -63,6 +63,28 @@ if ($pdo && $_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) &&
             $message = "<div style='color: red;'>Operation Failed: " . $e->getMessage() . "</div>";
         }
     }
+} elseif ($pdo && $_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['action'] === 'unbind') {
+    // 处理解绑
+    $id = $_POST['id'];
+    try {
+        $stmt = $pdo->prepare("DELETE FROM user_device_bindings WHERE id = ?");
+        $stmt->execute([$id]);
+        $message = "<div style='color: green; margin-bottom: 20px; background: #e6fffa; padding: 10px; border-radius: 4px;'>✅ 解绑成功</div>";
+    } catch (Exception $e) {
+        $message = "<div style='color: red;'>Unbind Failed: " . $e->getMessage() . "</div>";
+    }
+} elseif ($pdo && $_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['action'] === 'delete_device') {
+    // 处理删除设备
+    $deviceId = $_POST['device_id'];
+    try {
+        // 先删除相关绑定
+        $pdo->prepare("DELETE FROM user_device_bindings WHERE device_id = ?")->execute([$deviceId]);
+        // 再删除设备
+        $pdo->prepare("DELETE FROM devices WHERE id = ?")->execute([$deviceId]);
+        $message = "<div style='color: green; margin-bottom: 20px; background: #e6fffa; padding: 10px; border-radius: 4px;'>🗑️ 设备 <b>$deviceId</b> 已彻底删除</div>";
+    } catch (Exception $e) {
+        $message = "<div style='color: red;'>Delete Failed: " . $e->getMessage() . "</div>";
+    }
 }
 
 // 获取所有设备列表 (含绑定信息)
@@ -201,6 +223,16 @@ if ($pdo) {
                                     <?php if (!$dev['bound_phone']): ?>
                                         <button onclick="fillBind('<?php echo htmlspecialchars($dev['id']); ?>')"
                                             style="cursor: pointer; background: #007bff; color: white; border: none; padding: 4px 8px; border-radius: 4px; font-size: 12px;">选择绑定</button>
+
+                                        <form method="POST" action=""
+                                            onsubmit="return confirm('确定要彻底删除设备 <?php echo htmlspecialchars($dev['id']); ?> 吗？');"
+                                            style="display:inline; margin-left: 5px;">
+                                            <input type="hidden" name="action" value="delete_device">
+                                            <input type="hidden" name="device_id"
+                                                value="<?php echo htmlspecialchars($dev['id']); ?>">
+                                            <button type="submit"
+                                                style="cursor: pointer; background: #dc3545; color: white; border: none; padding: 4px 8px; border-radius: 4px; font-size: 12px;">删除</button>
+                                        </form>
                                     <?php else: ?>
                                         <button disabled
                                             style="background: #eee; color: #999; border: none; padding: 4px 8px; border-radius: 4px; font-size: 12px;">已占用</button>
@@ -231,6 +263,7 @@ if ($pdo) {
                             <th>手机号</th>
                             <th>设备 ID</th>
                             <th>绑定时间</th>
+                            <th>操作</th>
                         </tr>
                     </thead>
                     <tbody>
@@ -240,6 +273,14 @@ if ($pdo) {
                                 <td><?php echo htmlspecialchars($row['phone']); ?></td>
                                 <td><?php echo htmlspecialchars($row['device_id']); ?></td>
                                 <td><?php echo $row['bound_at']; ?></td>
+                                <td>
+                                    <form method="POST" action="" onsubmit="return confirm('确定要解绑吗？');">
+                                        <input type="hidden" name="action" value="unbind">
+                                        <input type="hidden" name="id" value="<?php echo $row['id']; ?>">
+                                        <button type="submit"
+                                            style="color: red; font-size: 12px; background: none; border: none; cursor: pointer; text-decoration: underline;">解绑</button>
+                                    </form>
+                                </td>
                             </tr>
                         <?php endforeach; ?>
                     </tbody>