test: add pytest coverage for LRC formatting, status, and export routes

[OmikronApex]

Twenty-fifth repo from the org test-coverage audit. This is the older, non-DB sibling of feedBack-plugin-lyrics-karaoke#12 - same sloppak-module dependency for /align and /save, so those routes are left for a follow-up; this PR covers what's testable standalone.

12 pytest tests:

• _format_lrc / _format_lrc_word_level (pure): MM:SS.CC timestamp formatting, inline word-level timestamps when words is present, falls back to line text without it, empty-input edge case
• /status: no server configured, healthy (200) and error-status-code server responses via mocked requests.get, connection-exception handling
• /export: missing-segments 400, header field presence when title/artist given vs. omitted, Content-Disposition filename sanitizes slashes

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📥 Commits

Reviewing files that changed from the base of the PR and between f172eef and e33868f.

📒 Files selected for processing (2)

• tests/conftest.py
• tests/test_lrc_and_routes.py

✨ Finishing Touches

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

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