refactor,feat: 批量代码重构与新增业务模块

1. 重命名枚举项与实体字段，修正类型引用
2. 新增IsNull扩展方法与多项字符串处理扩展
3. 新增大量业务DTO、服务接口与枚举定义
4. 重构RabbitMQ服务实现，替换旧版消息队列组件
5. 优化签到服务的宠物喂养事务逻辑
6. 移除冗余的项目引用与旧版消息队列代码
7. 新增Excel导出、导入模板相关工具方法

QYZH.InteractiveMagazine.Infrastructure/RabbitMQ/RabbitMQConnection.cs

@@ -0,0 +1,62 @@
+using RabbitMQ.Client;
+
+namespace QYZH.InteractiveMagazine.Infrastructure.RabbitMQ
+{
+    public interface IRabbitMQConnection : IDisposable
+    {
+        Task<IChannel> CreateChannel();
+    }
+
+    public class RabbitMQConnection : IRabbitMQConnection
+    {
+        private readonly ConnectionFactory _factory;
+        private readonly IConnection _connection;
+        private bool _isDisposed;
+
+        public RabbitMQConnection(ConnectionFactory factory)
+        {
+            _factory = factory ?? throw new ArgumentNullException(nameof(factory));
+            _connection = factory.CreateConnectionAsync().Result;
+        }
+
+        public async Task<IChannel> CreateChannel()
+        {
+            EnsureNotDisposed();
+            return await _connection.CreateChannelAsync();
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (_isDisposed) return;
+
+            if (disposing)
+            {
+                // Free any other managed objects here.
+            }
+
+            // Free any unmanaged objects here.
+            _connection.Dispose();
+
+            _isDisposed = true;
+        }
+
+        ~RabbitMQConnection()
+        {
+            Dispose(false);
+        }
+
+        private void EnsureNotDisposed()
+        {
+            if (_isDisposed)
+            {
+                throw new ObjectDisposedException(nameof(RabbitMQConnection));
+            }
+        }
+    }
+}