[Feature] Add multi-agent demos showcasing typical design patterns and industry use cases.

Feature Request

背景

在 1.1.0.0 版本发布后，社区正在推进整体示例（example）的升级。我们期望通过提供更接近企业实践的具体示例，帮助开发者快速理解框架的使用，同时指导企业自己的智能体应用开发。

目标

我们期望示例具备以下特点之一：

1. 能通过具体的示例，展示框架支持的抽象 Agent 模式，比如 Supervisor 模式、Workflow+Agent 模式、Routing 路由模式、Agenttic RAG 模式等。
2. 是一个业务场景的具体应用，能代表某个具体的、热门业务场景智能体应用实践，能被快速复制并使用。如Q&A答疑助手、支持多步骤任务的旅游助手等。

Background

Following the release of version 1.1.0.0, the community is advancing the upgrade of comprehensive examples. We aim to provide more practical, enterprise-aligned examples to help developers quickly grasp the framework's usage while guiding enterprises in their own agent application development.

Objective

We expect the examples to possess at least one of the following characteristics:

1. It can demonstrate the abstract Agent patterns supported by the framework through specific examples, such as the Supervisor pattern, Workflow+Agent pattern, Routing pattern, and Agentic RAG pattern.
2. It is a specific application of a business scenario, capable of representing a particular and popular business scenario for intelligent agent applications, and can be quickly replicated and utilized. Examples include Q&A support assistants and multi-step task-oriented travel assistants.

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