fix(dpmodel): forward spin inputs in DeepEval

[njzjz-bot]

Closes #5661.

Summary

• normalize and validate spin inputs before automatic batching so flattened multi-frame inputs are sliced with their coordinate frames
• forward extra model inputs through the dpmodel DeepEval adapter while keeping evaluator-owned inputs canonical
• retain the magnetic-atom mask in non-atomic DeepPot results
• add public-API regressions for forced one-frame batching and missing spin inputs

Why existing tests missed this

Existing dpmodel spin tests exercised direct model calls and serialization parity, not the DeepEval adapter. Public spin inference coverage targeted the PyTorch and PT2 backends, which already have dedicated spin forwarding paths. Those fixtures were also primarily single-frame, so they would not detect a flat spin tensor being left unsliced when automatic batching splits a multi-frame evaluation.

Validation

• pytest source/tests/infer/test_dpmodel_deep_eval_spin.py -q (2 passed)
• source/tests/common/test_auto_batch_size.py::TestAutoBatchSize::test_execute_all (passed)
• dpmodel non-spin DeepEval smoke evaluation (passed)
• ruff format . (1664 files unchanged)
• ruff check . (passed)
• git diff --check (passed)

Coding agent: Codex
Codex version: codex-cli 0.144.4
Model: gpt-5.6-sol
Reasoning effort: xhigh

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.33%. Comparing base (6c3b985) to head (c09d167).

Files with missing lines	Patch %	Lines
deepmd/dpmodel/infer/deep_eval.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5852      +/-   ##
==========================================
- Coverage   78.58%   78.33%   -0.26%     
==========================================
  Files        1050     1050              
  Lines      120637   120648      +11     
  Branches     4356     4357       +1     
==========================================
- Hits        94801    94504     -297     
- Misses      24278    24583     +305     
- Partials     1558     1561       +3     

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[njzjz]

Possible reviewers based on changed lines, exact file history, and exact-file review history:

• @wanghan-iapcm — 5 commits on changed files; 26 reviews on exact changed files (deepmd/dpmodel/infer/deep_eval.py).
• @iProzd — 3 commits on changed files (deepmd/dpmodel/infer/deep_eval.py).

No review request was made automatically.

Coding agent: Codex
Codex version: codex-cli 0.144.4
Model: gpt-5.6-sol
Reasoning effort: xhigh