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Add KeenEyes.Audio core infrastructure (Issue #419)

Implements Phase 1 of the audio system following established patterns from
Graphics and Input subsystems.

New projects:
- KeenEyes.Audio.Abstractions: Backend-agnostic interfaces and types
  - IAudioContext: High-level audio API
  - IAudioDevice: Low-level device operations
  - AudioClipHandle: Opaque resource handle
  - AudioFormat, AudioPlayState enums
  - AudioClipInfo metadata record

- KeenEyes.Audio: ECS integration
  - AudioUpdateSystem: Recycles source pool each frame

- KeenEyes.Audio.Silk: OpenAL implementation via Silk.NET
  - OpenALDevice: IAudioDevice implementation
  - SilkAudioContext: IAudioContext implementation
  - SilkAudioPlugin: World plugin for registration
  - WavDecoder: PCM WAV file parsing
  - SourcePool: Efficient one-shot playback pooling

Features:
- WAV file loading
- One-shot playback (fire and forget)
- Master volume control
- Automatic source pool management
- Plugin registration following SilkInputPlugin pattern

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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