Refactor: Unify and organize node categories

[drphero]

Unify and organize node categories under Lightricks/LTXV

Summary

This pull request refactors the node category structure to provide a unified, consistent, and functionally-grouped hierarchy for all nodes in the ComfyUI-LTXVideo custom node set.

Motivation

The existing node categories were fragmented and inconsistent, using various prefixes and top-level names such as lightricks/LTXV, ltxtricks, latent, fluxtapoz, and sampling. This inconsistency made it difficult for users to locate specific nodes within the ComfyUI right-click menu.

This change aims to significantly improve the user experience by consolidating all nodes under a clear Lightricks/LTXV root, with logical sub-categories based on their function.

Changes

All nodes have been moved to a new, standardized hierarchy under the Lightricks/LTXV root. The new structure groups nodes by their primary function:

New Category	Description	Example Nodes
Lightricks/LTXV/Loaders	Model, checkpoint, LoRA, and conditioning loaders.	LTXVGemmaCLIPModelLoader, LTXICLoRALoaderModelOnly
Lightricks/LTXV/Sampling	Samplers and core sampling logic nodes.	LTXVBaseSampler, LTXVTiledSampler, LTXFlowEditSamplerNode
Lightricks/LTXV/Conditioning	Prompt encoding, enhancement, and conditioning nodes.	LTXVGemmaEnhancePrompt, DynamicConditioning, GemmaAPITextEncode
Lightricks/LTXV/Latent	Latent manipulation, VAE decoding, and normalization.	LTXVTiledVAEDecode, LTXVAdainLatent, DecoderNoise
Lightricks/LTXV/Masking	Mask creation and processing nodes.	LTXVPreprocessMasks, LTXVSetAudioVideoMaskByTime
Lightricks/LTXV/Model Patches	Nodes that modify the core model (e.g., Q8, VAE patchers, attention overrides).	LTXVApplySTG, LTXVPatcherVAE, ModifyLTXModelNode
Lightricks/LTXV/Guidance	Guiders, advanced guide controls (STG, FlowEdit CFG), and guide application.	STGGuiderNode, MultimodalGuiderNode, LTXAddVideoICLoRAGuide
Lightricks/LTXV/Prediction	Model sampling prediction nodes.	LTXForwardModelSamplingPredNode, LTXReverseModelSamplingPredNode
Lightricks/LTXV/Utility	General utility and helper nodes.	ImageToCPU, LinearOverlapLatentTransition

Technical Notes

• Consolidated internal/experimental categories (ltxtricks, fluxtapoz) into the new functional groups.
• The change was applied to both the standard CATEGORY class attribute and the category field within define_schema methods (e.g., in iclora.py) to ensure full coverage.
• A total of 68 node categories were modified.