chore(deps): clean up Python dependency declarations

[jimlee2048]

Summary

• remove unused moviepy, sounddevice, and pdf2image dependencies
• declare imageio[ffmpeg] and scikit-learn directly instead of relying on transitive installations
• remove duplicate PDF dependency entries
• keep requirements.txt and pyproject.toml consistent

Why

The project no longer imports MoviePy or pdf2image, and sounddevice is not used by the current source code.

MoviePy 1.0.3 also requires decorator<5.0, which conflicts with the decorator>=5.2.1 requirement used by librosa 1.x. Although dependency resolvers may silently install an older librosa release, the stale MoviePy dependency unnecessarily restricts the shared ComfyUI environment.

FL_SaveWebM imports imageio and uses its ffmpeg backend, while FL_PixelArt imports scikit-learn directly. Declaring these packages explicitly avoids depending on unrelated transitive dependencies.

Impact

This changes dependency declarations only. No node interfaces or runtime behavior have been changed.

Fresh installations will no longer install the unused packages, and both supported dependency manifests now produce the same environment.

Validation

• resolved requirements.txt with uv for Python 3.11 and 3.13
• resolved pyproject.toml with uv for Python 3.11 and 3.13
• confirmed both manifests contain the same direct dependencies and version constraints
• confirmed the removed packages are no longer referenced by the project

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AI-assisted contribution: OpenAI Codex (GPT-5.6-sol) assisted with the dependency audit, implementation, validation, and PR documentation.