refactor: Major codebase restructuring for separation of concerns
## New Directory Structure
- utils/: Shared utilities (color_utils, shape_masks, noise_utils)
- core/: Central logic (params, constants, blending, transforms, model_compat, sampler, debug, logging)
- shaders/: Shader generators with BaseNoiseGenerator ABC and plugin registry
- nodes/: ComfyUI node class definitions
## Key Changes
- Centralized color interpolation logic eliminating duplication across shader files
- Unified shape mask generation with 20+ shape types
- Consolidated simplex/FBM/perlin noise implementations
- Created ShaderParams class for parameter normalization and validation
- Implemented ShaderRegistry for plugin-based shader registration
- Extracted blending operations and noise transforms to dedicated modules
- Added model compatibility layer for channel detection
- Moved stub visualizer/debugger to core/debug.py
- Added centralized logging configuration
## Refactored Shaders
- domain_warp.py: Now uses shared utilities and BaseNoiseGenerator
- tensor_field.py: Now uses shared utilities and BaseNoiseGenerator
- curl_noise.py: Now uses shared utilities and BaseNoiseGenerator
- temporal_coherent_noise.py: Now uses shared utilities and BaseNoiseGenerator
## Cleanup
- Removed duplicate SHADER_GENERATORS registry
- Added comprehensive type hints to all new modules
- Maintained backward compatibility with legacy API
AEmotionStudio
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