orion-ecs / keen-eye / 20873263566

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feat(graphics): Enhance RenderSystem for multi-light PBR rendering

Update RenderSystem to fully support the PBR shader:

- Collect up to 8 lights (directional, point, spot) into uniform arrays
- Bind all 5 PBR texture slots (base color, normal, metallic-roughness, occlusion, emissive)
- Set all material factor uniforms (baseColor, metallic, roughness, emissive, normalScale, occlusionStrength, alphaCutoff)
- Set texture presence flags for conditional shader logic
- Handle AlphaMode (blend vs opaque vs mask)
- Handle DoubleSided materials (disable culling)
- Maintain backward compatibility with legacy LitShader

Update PBR vertex shader to calculate normal matrix internally for simpler uniform interface.

Closes #886

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

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