feat(vip): 添加VIP客户管理功能

- 创建vip_customers表存储VIP客户信息
- 实现VIP客户添加、查看和删除功能
- 在预约页面增加VIP客户选择功能
- 添加VIP管理页面和API接口

get_vip_customers.php

@@ -0,0 +1,34 @@
+<?php
+header('Content-Type: application/json; charset=utf-8');
+header('Cache-Control: no-cache, must-revalidate');
+
+// 数据库连接配置
+$host = 'localhost';
+$dbname = 'carwash_db';
+$username = 'root';
+$password = '';
+
+try {
+    $pdo = new PDO("mysql:host=$host;dbname=$dbname;charset=utf8mb4", $username, $password);
+    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+    
+    // 查询所有VIP客户，按创建时间倒序排列
+    $stmt = $pdo->query("
+        SELECT id, customer_name, phone, car_model, car_number, email, birthday, is_active
+        FROM vip_customers 
+        WHERE is_active = 1 
+        ORDER BY created_at DESC
+    ");
+    
+    $vipCustomers = $stmt->fetchAll(PDO::FETCH_ASSOC);
+    
+    echo json_encode($vipCustomers, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
+    
+} catch(PDOException $e) {
+    http_response_code(500);
+    echo json_encode([
+        'error' => '数据库连接失败',
+        'message' => $e->getMessage()
+    ], JSON_UNESCAPED_UNICODE);
+}
+?>