Dev/flux tool from state dict

[qzzz95]

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[gemini-code-assist]

Summary of Changes

Hello @qzzz95, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the flexibility of several Flux tools within the diffsynth_engine by enabling their initialization directly from pre-existing model state dictionaries. This change is particularly useful for scenarios where model weights are already loaded in memory or need to be managed outside of direct file paths. The existing model loading logic has been cleanly refactored into from_pretrained class methods, ensuring a consistent and intuitive API for users whether they are loading models from disk or from in-memory state dictionaries.

Highlights

• New Initialization Method: Introduced a new class method, from_state_dict, to allow initialization of the Flux Inpainting, Outpainting, Reference, and ReplaceByControl tools directly from pre-loaded model state dictionaries.
• API Refactoring: The existing __init__ methods in these tools have been refactored into from_pretrained class methods, providing a clear and consistent API for loading models either from a path or from state dictionaries.
• Type Hinting and Imports: Updated necessary imports across the modified files to include FluxStateDicts and Dict for proper type hinting and functionality related to state dictionary handling.

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[gemini-code-assist]

Code Review

This pull request refactors several Flux...Tool classes to support initialization from state dictionaries, in addition to loading from pretrained model paths. This is achieved by moving the model loading logic from __init__ to a new from_pretrained classmethod, and adding a new from_state_dict classmethod. This is a good architectural improvement that increases the flexibility of these tools.

My review has identified a critical bug in FluxReplaceByControlTool where an incorrect model path is used, and a minor inconsistency in variable naming. Please see the detailed comments.