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

tests/Feature/AdminAuthLoginTest.php

@@ -1,10 +1,10 @@
 <?php
 
-use App\Lottery\ErrorCode;
 use App\Models\AdminUser;
+use App\Lottery\ErrorCode;
+use Illuminate\Support\Str;
 use App\Services\AdminCaptchaService;
 use Illuminate\Foundation\Testing\RefreshDatabase;
-use Illuminate\Support\Str;
 
 uses(RefreshDatabase::class);