orion-ecs / keen-eye / 20872545197 / 1

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feat(assets): Add sprite atlas, animation, and MP3 audio support

Implement comprehensive asset loading pipeline enhancements:

**MP3 Audio Support (#880)**
- Add NLayer 1.16.0 package for MP3 decoding
- Extend AudioClipLoader to support .mp3 files alongside .wav and .ogg
- Decode MP3 to PCM 16-bit audio format for OpenAL playback

**Sprite Atlas Loader (#878)**
- Add SpriteAtlasAsset for managing sprite regions from atlas textures
- Support TexturePacker and Aseprite JSON atlas formats
- Add SpriteRegion data structure with UV coordinate calculation
- Create AtlasJsonContext for AOT-compatible JSON serialization

**Animation File Format (#879)**
- Add custom .keanim animation file format
- Create AnimationAsset wrapping SpriteSheet with events
- AnimationLoader parses JSON and builds sprite sheet frames
- Support atlas-referenced sprites with automatic texture loading
- Add animation events with time-based triggering

All loaders registered in AssetsPlugin when dependencies are available.
Includes comprehensive unit tests for all new functionality.

Closes #878, #879, #880

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

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