refactor：拆分 API 路由与请求校验，统一 final 类和代码风格

app/Models/JackpotPool.php

@@ -3,11 +3,11 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 /** Jackpot 奖池配置与当前水位 {@see jackpot_pools} */
-class JackpotPool extends Model
+final class JackpotPool extends Model
 {
     protected $fillable = [
         'currency_code',