fix: use PQAnalysis info reader

[galjos]

Summary

• require PQAnalysis>=1.4.1 for single-entry QM/MM .info rows
• remove the local PQ info compatibility parser
• retain reader, GUI, and TUI regression coverage

Coordinates with PQAnalysis #159 and PQAnalysis v1.4.1.

Validation

• python -m pytest -m "not benchmark" -q (270 passed)
• release build and twine check for 0.8.6

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (85c3de3) to head (b8a16fe).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #95   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        11    -1     
  Lines          636       571   -65     
=========================================
- Hits           636       571   -65     

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

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