test: add pytest coverage for setlist CRUD and song ordering

[OmikronApex]

Twentieth repo from the org test-coverage audit.

16 pytest tests over routes.py (FastAPI TestClient):

• Setlist CRUD: list/create/rename/delete, blank-name validation on create+rename, 404-shaped {"error": "Not found"} for a missing id
• Song add: requires filename, assigns incrementing position, bumps the setlist's updated_at (verified via list ordering)
• Song remove: renumbers remaining positions contiguously, scoped to its own setlist (deleting via the wrong setlist id is a no-op)
• Reorder: song_ids array drives new position order, empty/missing song_ids rejected

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📥 Commits

Reviewing files that changed from the base of the PR and between 8ee8802 and a16128f.

📒 Files selected for processing (2)

• tests/conftest.py
• tests/test_setlists.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/add-basic-tests

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