feat: 高考志愿与定价分销链路更新（管理端/API/小程序）

- 新增高考志愿核心服务、模型、控制器与迁移脚本

- 同步管理端定价/分销/设置与小程序入口、历史、测试选择和支付逻辑

- 补充相关开发文档

Made-with: Cursor

api/app/controller/superadmin/Distribution.php

@@ -399,7 +399,7 @@ class Distribution extends BaseController
     private static function defaultTestSettings(): array
     {
         $item = ['enabled' => true, 'commissionType' => 'ratio', 'commissionRate' => 90, 'commissionAmountFen' => 0, 'noPayment' => false];
-        return ['face' => $item, 'mbti' => $item, 'sbti' => $item, 'disc' => $item, 'pdp' => $item];
+        return ['face' => $item, 'mbti' => $item, 'sbti' => $item, 'disc' => $item, 'pdp' => $item, 'gaokao' => $item];
     }
 
     private static function sanitizeTestSettings($raw): array