fix: 修复商户中心查询 RowVersion 列不存在问题

src/Infrastructure/TakeoutSaaS.Infrastructure/App/Persistence/TakeoutAppDbContext.cs

@@ -536,10 +536,12 @@ public sealed class TakeoutAppDbContext(
         builder.Property(x => x.IsFrozen).HasDefaultValue(false);
         builder.Property(x => x.FrozenReason).HasMaxLength(500);
         builder.Property(x => x.ClaimedByName).HasMaxLength(100);
-        builder.Property(x => x.RowVersion)
-            .IsRowVersion()
-            .IsConcurrencyToken()
-            .HasColumnType("bytea");
+        builder.Ignore(x => x.RowVersion);
+        builder.Property<uint>("xmin")
+            .HasColumnName("xmin")
+            .HasColumnType("xid")
+            .ValueGeneratedOnAddOrUpdate()
+            .IsConcurrencyToken();
         builder.HasIndex(x => x.TenantId);
         builder.HasIndex(x => new { x.TenantId, x.Status });
         builder.HasIndex(x => x.ClaimedBy);

src/Infrastructure/TakeoutSaaS.Infrastructure/App/Repositories/EfMerchantRepository.cs

@@ -25,6 +25,14 @@ public sealed class EfMerchantRepository(TakeoutAppDbContext context, TakeoutLog
             .FirstOrDefaultAsync(cancellationToken);
     }
 
+    /// <inheritdoc />
+    public Task<Merchant?> GetForUpdateAsync(long merchantId, long tenantId, CancellationToken cancellationToken = default)
+    {
+        return context.Merchants
+            .Where(x => x.TenantId == tenantId && x.Id == merchantId)
+            .FirstOrDefaultAsync(cancellationToken);
+    }
+
     /// <inheritdoc />
     public async Task<IReadOnlyList<Merchant>> SearchAsync(long tenantId, MerchantStatus? status, CancellationToken cancellationToken = default)
     {