Refactor sound state management

[themuffinator]

Summary

• extend SoundSystem to own backend selection, activation, registration, and painted-time state
• update sound initialization/shutdown and helper routines to call the new SoundSystem APIs instead of global variables
• adjust OpenAL, DMA, and OGG backends to query SoundSystem for state and access the current backend interface

Testing

• ninja -C build (fails: build.ninja missing)

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https://chatgpt.com/codex/tasks/task_e_69076c83eee083288befedc2d41e0946

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Declare soundSystem inside AL_AddLoopSounds

The new OpenAL helper AL_AddLoopSounds now calls soundSystem.BuildSoundList and soundSystem.SfxForHandle, but the function never defines a soundSystem reference or variable in its scope. There is no file‑scope soundSystem either, so this code will not compile (soundSystem is undefined). Add SoundSystem &soundSystem = S_GetSoundSystem(); at the start of this function before using it.

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