docs: selection and virtual render site demo

[GaoFuhong]

Description

虚拟渲染：

批量拖拽：

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Enhancement (changes that improvement of current feature or performance)
• Refactoring (changes that neither fixes a bug nor adds a feature)
• Test Case (changes that add missing tests or correct existing tests)
• Code style optimization (changes that do not affect the meaning of the code)
• Docs (changes that only update documentation)
• Chore (changes that don't modify src or test files)

Self Check before Merge

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[gemini-code-assist]

Summary of Changes

Hello @GaoFuhong, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求主要通过引入两个新的站点演示来增强文档内容。这些演示分别展示了多节点虚拟渲染和框选批量拖拽多节点的功能，旨在为用户提供更直观的实践案例，帮助他们更好地理解和利用相关特性，从而提升图表交互的性能和用户体验。

Highlights

• 虚拟渲染示例: 新增了一个演示多节点虚拟渲染功能的站点示例，展示了在大量节点场景下的性能优化。
• 批量拖拽示例: 新增了一个演示框选批量拖拽多节点功能的站点示例，提升了用户在复杂图表中的操作效率。
• 文档更新: 更新了站点元数据文件 meta.json，以包含这两个新的实践示例。

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[gemini-code-assist]

Code Review

您好，这次的 Pull Request 添加了两个关于虚拟渲染和框选拖拽的站点示例，代码清晰地展示了 X6 的相关功能。我主要针对 TypeScript 代码的类型定义、代码冗余和语法正确性提出了一些改进建议，希望能帮助提升代码质量和可维护性。具体细节请参考文件中的评论。

[gemini-code-assist]

为了提高代码的类型安全和可读性，建议为 nodes 数组指定 Node[] 类型，而不是 any[]。

要应用此更改，你还需要在文件顶部从 @antv/x6 导入 Node 类型：

import { Graph, Selection, Node } from '@antv/x6'

Suggested change

	const nodes: any[] = []
	const nodes: Node[] = []

[gemini-code-assist]

为了提高代码的类型安全和可读性，建议为 nodes 数组指定 Node[] 类型，而不是 any[]。

要应用此更改，你还需要在文件顶部从 @antv/x6 导入 Node 类型：

import { Graph, Scroller, Node } from '@antv/x6'

Suggested change

	const nodes: any[] = []
	const nodes: Node[] = []