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

app/Models/OddsVersion.php

@@ -4,11 +4,11 @@ namespace App\Models;
 
 use App\Lottery\ConfigVersionStatus;
 use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 /** {@see odds_versions} */
-class OddsVersion extends Model
+final class OddsVersion extends Model
 {
     protected $fillable = [
         'version_no',
@@ -29,7 +29,7 @@ class OddsVersion extends Model
 
     protected static function booted(): void
     {
-        static::saving(function (OddsVersion $m): void {
+        self::saving(function (OddsVersion $m): void {
             if ($m->status === null || $m->status === '') {
                 $m->status = ConfigVersionStatus::Draft->value;
             }