fix: PDF import header matching; dependency and import cleanup

[PPeitsch]

Last cleanup before the release, from the code review.

• PDF import (C12): column headers are matched by whole word. Before, any header containing "in" / "out" ("Login method", "Checkout notes") was taken as the entry or exit column and could override the real one. New test fails on the old code.
• M3: beautifulsoup4 pinned to the stable 4.13.4 instead of 4.13.0b2.
• M7: app.routes exports every blueprint.
• Unused imports removed from app/routes/import_log.py.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

Files with missing lines	Coverage Δ
app/routes/__init__.py	100.00% <100.00%> (ø)
app/routes/import_log.py	91.71% <100.00%> (-0.26%)	⬇️
app/services/importer/pdf_importer.py	95.12% <100.00%> (+0.12%)	⬆️

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