feat(cqrs): 添加流式命令、查询和请求处理器基类

- 新增 AbstractStreamCommandHandler 基类支持流式命令处理
- 新增 AbstractStreamQueryHandler 基类支持流式查询处理
- 新增 AbstractStreamRequestHandler 基类支持流式请求处理
- 所有基类继承 ContextAwareBase 并实现对应的流式处理器接口
- 提供统一的异步可枚举响应序列处理机制
- 支持取消令牌用于控制流式操作的执行过程

GFramework.Core/cqrs/command/AbstractStreamCommandHandler.cs

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+// Copyright (c) 2026 GeWuYou
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using GFramework.Core.rule;
+using Mediator;
+
+namespace GFramework.Core.cqrs.command;
+
+/// <summary>
+/// 抽象流式命令处理器基类
+/// 继承自ContextAwareBase并实现IStreamCommandHandler接口，为具体的流式命令处理器提供基础功能
+/// 支持流式处理命令并产生异步可枚举的响应序列
+/// </summary>
+/// <typeparam name="TCommand">流式命令类型，必须实现IStreamCommand接口</typeparam>
+/// <typeparam name="TResponse">流式命令响应元素类型</typeparam>
+public abstract class AbstractStreamCommandHandler<TCommand, TResponse> : ContextAwareBase,
+    IStreamCommandHandler<TCommand, TResponse>
+    where TCommand : IStreamCommand<TResponse>
+{
+    /// <summary>
+    /// 处理流式命令并返回异步可枚举的响应序列
+    /// 由具体的流式命令处理器子类实现流式处理逻辑
+    /// </summary>
+    /// <param name="command">要处理的流式命令对象</param>
+    /// <param name="cancellationToken">取消令牌，用于取消流式处理操作</param>
+    /// <returns>异步可枚举的响应序列，每个元素类型为TResponse</returns>
+    public abstract IAsyncEnumerable<TResponse> Handle(TCommand command, CancellationToken cancellationToken);
+}

GFramework.Core/cqrs/query/AbstractStreamQueryHandler.cs

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+// Copyright (c) 2026 GeWuYou
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using GFramework.Core.rule;
+using Mediator;
+
+namespace GFramework.Core.cqrs.query;
+
+/// <summary>
+/// 抽象流式查询处理器基类
+/// 继承自ContextAwareBase并实现IStreamQueryHandler接口，为具体的流式查询处理器提供基础功能
+/// 支持流式处理查询并产生异步可枚举的响应序列，适用于大数据量或实时数据查询场景
+/// </summary>
+/// <typeparam name="TQuery">流式查询类型，必须实现IStreamQuery接口</typeparam>
+/// <typeparam name="TResponse">流式查询响应元素类型</typeparam>
+public abstract class AbstractStreamQueryHandler<TQuery, TResponse> : ContextAwareBase,
+    IStreamQueryHandler<TQuery, TResponse>
+    where TQuery : IStreamQuery<TResponse>
+{
+    /// <summary>
+    /// 处理流式查询并返回异步可枚举的响应序列
+    /// 由具体的流式查询处理器子类实现流式查询处理逻辑
+    /// </summary>
+    /// <param name="query">要处理的流式查询对象</param>
+    /// <param name="cancellationToken">取消令牌，用于取消流式查询操作</param>
+    /// <returns>异步可枚举的响应序列，每个元素类型为TResponse</returns>
+    public abstract IAsyncEnumerable<TResponse> Handle(TQuery query, CancellationToken cancellationToken);
+}

GFramework.Core/cqrs/request/AbstractStreamRequestHandler.cs

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+// Copyright (c) 2026 GeWuYou
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// 
+//     http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+using GFramework.Core.rule;
+using Mediator;
+
+namespace GFramework.Core.cqrs.request;
+
+/// <summary>
+/// 抽象流式请求处理器基类
+/// 继承自ContextAwareBase并实现IStreamRequestHandler接口，为具体的流式请求处理器提供基础功能
+/// 支持流式处理请求并产生异步可枚举的响应序列，适用于需要逐步返回结果的请求处理场景
+/// </summary>
+/// <typeparam name="TRequest">流式请求类型，必须实现IStreamRequest接口</typeparam>
+/// <typeparam name="TResponse">流式请求响应元素类型</typeparam>
+public abstract class AbstractStreamRequestHandler<TRequest, TResponse> : ContextAwareBase,
+    IStreamRequestHandler<TRequest, TResponse>
+    where TRequest : IStreamRequest<TResponse>
+{
+    /// <summary>
+    /// 处理流式请求并返回异步可枚举的响应序列
+    /// 由具体的流式请求处理器子类实现流式请求处理逻辑
+    /// </summary>
+    /// <param name="request">要处理的流式请求对象</param>
+    /// <param name="cancellationToken">取消令牌，用于取消流式请求操作</param>
+    /// <returns>异步可枚举的响应序列，每个元素类型为TResponse</returns>
+    public abstract IAsyncEnumerable<TResponse> Handle(TRequest request, CancellationToken cancellationToken);
+}