fix(assets): Auto-generate smooth normals for OBJ meshes if missing

Updated asset_packer to detect missing normals in OBJ files.
Implemented a 2-pass parser:
1. Read geometry and connectivity.
2. If normals are missing:
   - Compute face normals using cross product.
   - Accumulate and average normals per vertex (Smooth Shading).
   - Update face indices to map normals 1:1 with positions.
This fixes the 'no shading' issue for assets like dodecahedron.obj which lack normals.

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