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

tests/Feature/AuditLoggerTest.php

@@ -1,9 +1,9 @@
 <?php
 
 use App\Models\AuditLog;
+use Illuminate\Http\Request;
 use App\Services\AuditLogger;
 use Illuminate\Foundation\Testing\RefreshDatabase;
-use Illuminate\Http\Request;
 
 uses(RefreshDatabase::class);