feat(预约系统): 添加会员类型和客户来源功能

在预约系统中新增会员类型(VIP/普通)和客户来源字段，包含数据库修改、表单添加和展示优化

bookings.php

@@ -110,6 +110,32 @@ try {
                                 <span class="detail-label">预约时间：</span>
                                 <span class="detail-value"><?php echo date('H:i', strtotime($booking['start_time'])); ?> - <?php echo date('H:i', strtotime($booking['end_time'])); ?></span>
                             </div>
+                            <div class="detail-item">
+                                <span class="detail-label">会员类型：</span>
+                                <span class="detail-value">
+                                    <?php if ($booking['member_type'] === 'VIP会员'): ?>
+                                        <span style="color: #ffd700; font-weight: bold;">👑 VIP会员</span>
+                                    <?php else: ?>
+                                        <span style="color: #666;">普通客户</span>
+                                    <?php endif; ?>
+                                </span>
+                            </div>
+                            <div class="detail-item">
+                                <span class="detail-label">客户来源：</span>
+                                <span class="detail-value">
+                                    <?php
+                                    $source_icons = [
+                                        '抖音' => '🎵',
+                                        '微信' => '💬', 
+                                        '快手' => '⚡',
+                                        '朋友介绍' => '🤝',
+                                        '其他' => '📋'
+                                    ];
+                                    $icon = $source_icons[$booking['source']] ?? '📋';
+                                    echo $icon . ' ' . $booking['source'];
+                                    ?>
+                                </span>
+                            </div>
                         </div>
 
                         <?php if ($booking['notes']): ?>