fix: preserve case in GPT-SoVITS synthesis parameters

[xiongyuyang]

Modifications

GPT-SoVITS default parameters currently lowercase every value. For example, /Voices/Alice.WAV becomes /voices/alice.wav, which can break reference audio lookup on case-sensitive filesystems. Prompt text such as Hello NASA is also modified before sending it to the server.

Preserve string casing while retaining string serialization for numeric values and lowercase true/false for booleans. Add parameterized regression coverage for reference audio paths, prompt text, both boolean values, integers and floats.

• This is NOT a breaking change.

Screenshots or Test Results

Verification: python -m pytest tests/unit/test_gsv_selfhosted_source.py -q -p no:cacheprovider

Before the fix: 2 failed (path and prompt casing), 4 passed.
After the fix: 6 passed, 1 existing audioop deprecation warning on Windows/Python 3.12.
Ruff check and commit hooks passed. These tests exercise request parameter construction; a running GPT-SoVITS server/model was not used.

Checklist

• Changes are tested and verification steps/results are provided above.
• No new dependencies.
• No malicious code.
• New feature discussion: not applicable (bug fix).

Summary by Sourcery

Preserve GPT-SoVITS synthesis parameter values without altering user-provided string casing.

Bug Fixes:

• Preserve the casing of GPT-SoVITS string synthesis parameters while continuing to serialize booleans as lowercase and numeric values as strings.

Tests:

• Add parameterized regression coverage for reference audio paths, prompt text, booleans, integers, and floats.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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[kilisamemarisaaa]

Verified commit e102780 locally from the PR tarball on Windows/Python 3.12: python -m pytest tests/unit/test_gsv_selfhosted_source.py -q passed (6 passed; only the existing audioop deprecation warning). Ruff check passed for both changed files. The implementation preserves string casing, serializes numeric values as strings, and keeps booleans lowercase for the GPT-SoVITS API. No additional issues found.