🧹 [code health improvement] Remove deprecated Audio::lock and unlock methods

[segin]

• 🎯 What: Removed the deprecated lock and unlock methods from the Audio class.
• 💡 Why: These legacy methods use SDL_LockAudio and SDL_UnlockAudio, which are no longer needed as modern thread safety is handled by std::mutex. Removing dead code improves code maintainability.
• ✅ Verification: Confirmed that these methods are not used anywhere in the codebase using grep. Compiled and tested to ensure no functionality is broken.
• ✨ Result: Cleaner API for the Audio class without legacy unused methods.

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PR created automatically by Jules for task 6754502607724929723 started by @segin

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[Copilot]

Pull request overview

This PR removes the deprecated Audio::lock() / Audio::unlock() API that wrapped SDL_LockAudio() / SDL_UnlockAudio(), simplifying the Audio class interface now that thread safety is handled via std::mutex elsewhere in the audio pipeline.

Changes:

• Removed Audio::lock() and Audio::unlock() declarations from the public Audio header.
• Removed the corresponding legacy SDL lock/unlock implementations from src/audio.cpp.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
include/audio.h	Drops the deprecated lock()/unlock() methods from the Audio public interface.
src/audio.cpp	Deletes the legacy SDL audio lock/unlock method implementations.

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