fix(deps): declare python-multipart as a direct dependency

[tsondo]

Summary

The API server uses FastAPI UploadFile/Form endpoints (acestep/api/route_setup.py, acestep/api/http/release_task_audio_paths.py), which require python-multipart at route-definition time. It is currently only present transitively through gradio, so any install without gradio (e.g. a headless API-server deployment) fails at import with FastAPI's "Form data requires python-multipart" error.

This declares it explicitly in pyproject.toml and requirements.txt. No behavior change for existing installs — the package is already present in any environment that has gradio.

Complementary to #1276 (making acestep.api_server importable without gradio), which is the scenario that exposes this gap — but this fix stands on its own: load-bearing dependencies should be declared, not inherited.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Added support for multipart form data handling.
  • Updated the project’s runtime requirements to include the necessary multipart-processing package.

[coderabbitai]

Caution

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📝 Walkthrough

Walkthrough

Adds python-multipart>=0.0.18 to the project metadata and requirements dependency lists.

Changes

Multipart dependency update

Layer / File(s)	Summary
Add multipart dependency pyproject.toml, requirements.txt	Both dependency declarations now include python-multipart>=0.0.18.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Poem

I’m a rabbit with packages to pack,
Multipart hops into the stack.
Two lists now agree,
Versioned neatly,
And dependencies stay on track!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding python-multipart as a direct dependency.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[ChuxiJ]

Thanks for the clean dependency fix. I checked this locally in a temporary worktree and uv lock --check reports that uv.lock needs to be updated after adding python-multipart>=0.0.18.

Could you please include the corresponding uv.lock update in this PR? After that this should be straightforward to merge.