Add Lemonfox transcription provider

[DYSfu]

Summary

• add a Lemonfox Speech-to-Text provider available through --api lemonfox
• document the required Lemonfox environment variables and usage example
• add mocked unit coverage for the OpenAI-compatible transcription request and CLI routing

Validation

• . .venv/bin/activate && PYTHONPATH=src python -m unittest discover -s tests -v
• . .venv/bin/activate && PYTHONPATH=src python -m py_compile src/sapat/script.py src/sapat/transcription/lemonfox.py tests/test_lemonfox_transcription.py tests/test_script.py
• . .venv/bin/activate && PYTHONPATH=src python -m sapat.script --help
• git diff --check

Related Daytona content bounty: daytonaio/content#13

[DYSfu]

Pushed a follow-up fix in decb020 after rechecking the PR locally.

The CLI now imports only the selected transcription provider, so Lemonfox routing and tests no longer require unrelated provider SDKs to be importable at module import time.

Validation:

• PYTHONPATH=src python -m unittest discover -s tests -v
• PYTHONPATH=src python -m py_compile src/sapat/script.py src/sapat/transcription/lemonfox.py tests/test_lemonfox_transcription.py tests/test_script.py
• PYTHONPATH=src python -m sapat.script --help
• git diff --check

[nibzard]

Thank you for this contribution! Your implementation was reviewed as part of a batch review of all incoming provider PRs.

We've decided to take a different approach: instead of merging individual provider PRs (which all targeted a different code architecture than what exists on main), we've refactored the entire codebase into a proper provider plugin architecture with auto-discovery and shared mixins. Your provider's API integration patterns were used as reference when building the Lemonfox provider in the new architecture.

The refactor is on branch feat/provider-plugin-architecture and includes 29 providers, 176 tests, and a clean plugin system. We appreciate your contribution — it helped shape the final design. Closing this in favor of the unified approach.