feat: 商户冻结/解冻功能及字典缓存重构

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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

@@ -1,23 +1,27 @@
 using MediatR;
 using Microsoft.Extensions.Logging;
-using System.Security.Cryptography;
 using TakeoutSaaS.Application.App.Merchants.Commands;
 using TakeoutSaaS.Application.App.Merchants.Dto;
 using TakeoutSaaS.Domain.Merchants.Entities;
+using TakeoutSaaS.Domain.Merchants.Enums;
 using TakeoutSaaS.Domain.Merchants.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Security;
 
 namespace TakeoutSaaS.Application.App.Merchants.Handlers;
 
 /// <summary>
 /// 创建商户命令处理器。
 /// </summary>
-public sealed class CreateMerchantCommandHandler(IMerchantRepository merchantRepository, ILogger<CreateMerchantCommandHandler> logger)
+public sealed class CreateMerchantCommandHandler(
+    IMerchantRepository merchantRepository,
+    ICurrentUserAccessor currentUserAccessor,
+    ILogger<CreateMerchantCommandHandler> logger)
     : IRequestHandler<CreateMerchantCommand, MerchantDto>
 {
     /// <inheritdoc />
     public async Task<MerchantDto> Handle(CreateMerchantCommand request, CancellationToken cancellationToken)
     {
-        // 1. 构建商户实体
+        // 1. 构建商户实体（RowVersion 由 PostgreSQL xmin 自动管理）
         var merchant = new Merchant
         {
             TenantId = request.TenantId,
@@ -28,16 +32,39 @@ public sealed class CreateMerchantCommandHandler(IMerchantRepository merchantRep
             ContactPhone = request.ContactPhone.Trim(),
             ContactEmail = request.ContactEmail?.Trim(),
             Status = request.Status,
-            RowVersion = RandomNumberGenerator.GetBytes(16),
             JoinedAt = DateTime.UtcNow
         };
 
-        // 2. 持久化
+        // 2. 如果状态为已通过，设置审核通过时间和审核人
+        if (request.Status == MerchantStatus.Approved)
+        {
+            merchant.ApprovedAt = DateTime.UtcNow;
+            merchant.ApprovedBy = currentUserAccessor.UserId;
+        }
+
+        // 3. 持久化商户
         await merchantRepository.AddMerchantAsync(merchant, cancellationToken);
         await merchantRepository.SaveChangesAsync(cancellationToken);
 
-        // 3. 记录日志
-        logger.LogInformation("创建商户 {MerchantId} - {BrandName}", merchant.Id, merchant.BrandName);
+        // 4. 如果状态为已通过，添加默认审核通过记录
+        if (request.Status == MerchantStatus.Approved)
+        {
+            var auditLog = new MerchantAuditLog
+            {
+                TenantId = merchant.TenantId,
+                MerchantId = merchant.Id,
+                Action = MerchantAuditAction.ReviewApproved,
+                Title = "商户创建时直接通过审核",
+                Description = "平台管理员创建商户时选择无需审核，系统自动通过",
+                OperatorId = currentUserAccessor.UserId == 0 ? null : currentUserAccessor.UserId,
+                OperatorName = currentUserAccessor.UserId == 0 ? "system" : $"user:{currentUserAccessor.UserId}"
+            };
+            await merchantRepository.AddAuditLogAsync(auditLog, cancellationToken);
+            await merchantRepository.SaveChangesAsync(cancellationToken);
+        }
+
+        // 5. 记录日志
+        logger.LogInformation("创建商户 {MerchantId} - {BrandName}，状态：{Status}", merchant.Id, merchant.BrandName, merchant.Status);
         return MapToDto(merchant);
     }