[CodeStyle] Add yamlfmt hook and check case conflict hook

[SigureMo]

• 升级 dochook 到 v0.6.0，添加 check-case-conflict hook，用于检查新增文件是否与之前文件会在大小写不敏感操作系统上存在冲突，比如 /a/b/c.ext 和 /a/b/C.ext，推荐将后者改为 /a/b/C__upper.ext，因为 macOS 默认文件系统 APFS 和 Windows 默认文件系统 NTFS 都有这个问题，因此这个检查非常有必要
• 顺带引入 yamlfmt 用于格式化 pre-commit-config 和一些其他 yaml 文件
• 添加 .editorconfig

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[Copilot]

Pull Request Overview

This PR adds yamlfmt for YAML formatting and a case conflict checker to prevent filesystem conflicts on case-insensitive systems like macOS and Windows.

• Updates dochooks to v0.6.0 and adds check-case-conflict hook
• Introduces yamlfmt for YAML file formatting
• Adds .editorconfig for consistent code style across editors

Reviewed Changes

Copilot reviewed 3 out of 8 changed files in this pull request and generated no comments.

File	Description
.yamlfmt	Configuration file for yamlfmt YAML formatter
.pre-commit-config.yaml	Updates dochooks version, adds case conflict checker and yamlfmt hook
.editorconfig	Adds editor configuration for consistent formatting across different file types

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