chore: add documentation comments and stylecop rules

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

@@ -15,21 +15,21 @@ public sealed class SearchMerchantsQueryHandler(
     ITenantProvider tenantProvider)
     : IRequestHandler<SearchMerchantsQuery, PagedResult<MerchantDto>>
 {
-    private readonly IMerchantRepository _merchantRepository = merchantRepository;
-    private readonly ITenantProvider _tenantProvider = tenantProvider;
-
     /// <inheritdoc />
     public async Task<PagedResult<MerchantDto>> Handle(SearchMerchantsQuery request, CancellationToken cancellationToken)
     {
-        var tenantId = _tenantProvider.GetCurrentTenantId();
-        var merchants = await _merchantRepository.SearchAsync(tenantId, request.Status, cancellationToken);
+        // 1. 获取租户并查询商户
+        var tenantId = tenantProvider.GetCurrentTenantId();
+        var merchants = await merchantRepository.SearchAsync(tenantId, request.Status, cancellationToken);
 
+        // 2. 排序与分页
         var sorted = ApplySorting(merchants, request.SortBy, request.SortDescending);
         var paged = sorted
             .Skip((request.Page - 1) * request.PageSize)
             .Take(request.PageSize)
             .ToList();
 
+        // 3. 映射 DTO
         var items = paged.Select(merchant => new MerchantDto
         {
             Id = merchant.Id,
@@ -45,6 +45,7 @@ public sealed class SearchMerchantsQueryHandler(
             CreatedAt = merchant.CreatedAt
         }).ToList();
 
+        // 4. 返回分页结果
         return new PagedResult<MerchantDto>(items, request.Page, request.PageSize, merchants.Count);
     }