Feat/no user join ready dave

[Neko-Life]

Draft

• BREAKING CHANGE: Remove unused ancient event router from unknown origin on_voice_user_talking
• Fix ready event not firing when no user is in the voice channel
• Implement opus stop frames for smooth pause/stop

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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[braindigitalis]

one thing for your to-do, it fails when you build without voice as you need to change the signature in src/dpp/voice/stubs