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

database/seeders/OddsPrizeScopesBackfillSeeder.php

@@ -3,13 +3,13 @@
 namespace Database\Seeders;
 
 use App\Models\OddsVersion;
-use App\Support\OddsStandardScopes;
 use Illuminate\Database\Seeder;
+use App\Support\OddsStandardScopes;
 
 /**
  * 为历史 odds_versions 补全 §5.5 五档 prize_scope（幂等，可重复执行）。
  */
-class OddsPrizeScopesBackfillSeeder extends Seeder
+final class OddsPrizeScopesBackfillSeeder extends Seeder
 {
     public function run(): void
     {