chore: add documentation comments and stylecop rules

src/Application/TakeoutSaaS.Application/App/Merchants/Handlers/GetMerchantDocumentsQueryHandler.cs

@@ -17,16 +17,15 @@ public sealed class GetMerchantDocumentsQueryHandler(
     ITenantProvider tenantProvider)
     : IRequestHandler<GetMerchantDocumentsQuery, IReadOnlyList<MerchantDocumentDto>>
 {
-    private readonly IMerchantRepository _merchantRepository = merchantRepository;
-    private readonly ITenantProvider _tenantProvider = tenantProvider;
-
     public async Task<IReadOnlyList<MerchantDocumentDto>> Handle(GetMerchantDocumentsQuery request, CancellationToken cancellationToken)
     {
-        var tenantId = _tenantProvider.GetCurrentTenantId();
-        _ = await _merchantRepository.FindByIdAsync(request.MerchantId, tenantId, cancellationToken)
+        // 1. 获取租户上下文并校验商户存在
+        var tenantId = tenantProvider.GetCurrentTenantId();
+        _ = await merchantRepository.FindByIdAsync(request.MerchantId, tenantId, cancellationToken)
             ?? throw new BusinessException(ErrorCodes.NotFound, "商户不存在");
 
-        var documents = await _merchantRepository.GetDocumentsAsync(request.MerchantId, tenantId, cancellationToken);
+        // 2. 查询证照列表
+        var documents = await merchantRepository.GetDocumentsAsync(request.MerchantId, tenantId, cancellationToken);
         return MerchantMapping.ToDocumentDtos(documents);
     }
 }