* pip: declare the Studio dependencies the wheel's own modules import
The wheel packages studio/ and studio.backend*, so pip install unsloth puts
five commands on PATH -- train, export, chat, inference, studio -- and every one
of them imports studio.backend.*. None of those imports were declared, so all
five ended in a rich traceback at ModuleNotFoundError: No module named
'structlog' (#4701, #5260, #7147). --help rendered fine for all of them because
typer defers the import, which is why this went unnoticed.
Walking module-level, non-try-guarded imports from each entry point shows
structlog is the only hard requirement they share, once starlette's
annotation-only import in loggers/handlers.py moves under TYPE_CHECKING. So
structlog becomes a core dependency and the rest of the server stack (fastapi,
uvicorn, matplotlib, pandas, pymupdf, ...) becomes a [studio] extra mirroring
studio/backend/requirements/studio.txt, with a test that fails if the two drift.
pip install unsloth -> train / export work
pip install "unsloth[studio]" -> the server works
* Apply ruff-format quote normalisation
* Trim the comments added in this PR
735fcde44c