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/Dictionary/Models/DictionaryGroupDto.cs

@@ -64,7 +64,7 @@ public sealed class DictionaryGroupDto
     /// <summary>
     /// 并发控制字段。
     /// </summary>
-    public byte[] RowVersion { get; init; } = Array.Empty<byte>();
+    public uint RowVersion { get; init; }
 
     /// <summary>
     /// 字典项集合。