tools/lib/route: dedupe segment file mapping logic

[codesage1]

Description

This refactor removes repeated segment-file mapping logic in tools/lib/route.py while preserving existing behavior and public method signatures.

Goals:

• Deduplicate path-list generation in Route (log_paths, qlog_paths, camera_paths, dcamera_paths, ecamera_paths, qcamera_paths)
• Reuse a single internal mapping/helper flow for both local and remote segment parsing
• Keep behaviour unchanged:
  • local discovery keeps first-match behaviour
  • remote discovery keeps last-match behaviour

Regression coverage was added in tools/lib/tests/test_route_library.py for:

• local segment discovery across supported layouts
• remote file mapping precedence
• sparse segment handling (None holes)
• existing SegmentName parsing behaviour

Verification

• ruff check tools/lib/route.py tools/lib/tests/test_route_library.py
• pytest -o addopts='' --confcutdir=tools/lib/tests tools/lib/tests/test_route_library.py

[github-actions]

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