fix(report): use current settings and udev rule paths

[Ziusz]

Summary

Small cleanup for two misleading sections in trcc report. Both issues were spotted in the diagnostic output attached to #272.

Changes:

• read settings from trcc.json instead of the old config.json path
• look for 99-trcc-lcd.rules in the standard system, runtime, local, and distro package locations
• update the hint from the obsolete 99-trcc.rules name to the current 99-trcc-lcd.rules filename
• add regression tests for both fixes

This prevents existing settings files and udev rules from being incorrectly reported as missing.

Checklist

• Tests pass (pytest -v --tb=short)
• Linter clean (ruff check .)
• Tested on hardware (if device-specific change)
• New tests added (if adding functionality)