feat: add support for readthedocs.com domain

[CoderQudratov]

Fixes #8335

Changes

• Added domain param to route pattern (org|com)
• Updated handle() to use dynamic domain (defaults to org)
• Updated openApi paths to include domain
• Added tests for .com and explicit .org domain

Testing

• Existing tests pass (backward compatible)
• New tests added for readthedocs.com

[github-actions]

	Warnings
⚠️	This PR modified service code for github but not its test code. That's okay so long as it's refactoring existing code.
⚠️	This PR modified service code. Please run tests by including affected services in the pull request title.
⚠️	Found badge URL that may not follow our standard route abbreviations in services/readthedocs/readthedocs.service.js. Please ensure you've reviewed our conventions.

	Messages
📖	✨ Thanks for your contribution to Shields, @CoderQudratov!

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[CoderQudratov]

Hi @chris48s! I've added support for the readthedocs.com domain as discussed. All checks are passing. Could you please review when you get a chance? 🙏

[PyvesB]

Hello @CoderQudratov 👋🏻

A number of changes don't seem related to Read the Docs, please remove them from the PR.

Do any other Read the Docs domains exist (i.e. not readthedocs.com or readthedocs.org)? Is it for example possible to self-host your own Read the Docs instance under an arbitrary domain?