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feat(graphics): Add Image-Based Lighting (IBL) for realistic ambient lighting

Implement IBL system for environment-based reflections and ambient lighting:
- Add Environment component with IBL settings (intensity, rotation)
- Add ActiveEnvironmentTag for marking active environment entities
- Add IblData/IblSettings data structures for IBL configuration
- Add IBL shaders for irradiance, specular pre-filtering, and BRDF LUT generation
- Add IblManager for processing HDR environment maps into IBL textures
- Add PBR+IBL fragment shader variant with full IBL integration
- Integrate IBL with RenderSystem (texture binding, shader selection)
- Add HDR texture support to graphics abstractions
- Add cubemap texture binding support

The IBL system provides:
- Diffuse ambient from irradiance cubemap convolution
- Specular reflections from pre-filtered environment maps
- Split-sum approximation using BRDF lookup table
- Environment rotation and intensity controls
- Automatic shader selection (Custom > Shadows > IBL > Lit)

Closes #896

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

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