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feat: refactor spring bones from GLB extensions to metadata

Refactor spring bone parameter storage from GLB file extensions (Option 1)
to wearable item metadata JSON (Option 2).

- Remove GLB binary patching (patchGltfSpringBones)
- Save spring bone params to item.data.springBones metadata on save
- Load spring bone params from metadata in ItemProvider
- Simplify parseSpringBones to only detect bone names/hierarchy
- Add SpringBonesData type to WearableData
- Update tests to reflect new metadata-based approach

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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