feat: 新增 BookStack 的 PHP 扩展模板

[Anyexyz]

What this PR does / why we need it?

增强 PHP 模板生态

Summary of your change

新增 BookStack 的 PHP 扩展模板

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

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