fix: export ABACUS structures for atomic LAMMPS

[njzjz-bot]

Summary

• remove ABACUS magnetic moments from the per-frame LAMMPS export copy
• keep the original configuration metadata intact
• produce five-column atom records compatible with the atom_style atomic exploration input

Tests

• PYTHONPATH=tests python -m unittest -v tests.conf.test_file_conf
• ruff format --check dpgen2/conf/conf_generator.py tests/conf/test_file_conf.py
• isort --check-only dpgen2/conf/conf_generator.py tests/conf/test_file_conf.py
• git diff --check

Closes #312

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

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📥 Commits

Reviewing files that changed from the base of the PR and between 6b01f29 and 66bff55.

📒 Files selected for processing (2)

• dpgen2/conf/conf_generator.py
• tests/conf/test_file_conf.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.44%. Comparing base (6b01f29) to head (66bff55).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #390   +/-   ##
=======================================
  Coverage   84.43%   84.44%           
=======================================
  Files         104      104           
  Lines        6110     6113    +3     
=======================================
+ Hits         5159     5162    +3     
  Misses        951      951           

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