fix(vasp): collect OUTCAR files from multiple directories

[njzjz-bot]

Fixes #894.

Recursively discover and deterministically parse standard-named OUTCAR files for MultiSystems conversion.

Tests: Relevant VASP/MultiSystems tests plus CLI deepmd/npy conversion.

Why existing tests missed it: Tests covered single-file LabeledSystem parsing and other multi-mode backends, never VASP default multi-directory discovery.

Coding agent: Codex
Codex version: codex-cli 0.144.4
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 0416b54 and d879128.

📒 Files selected for processing (2)

• dpdata/plugins/vasp.py
• tests/test_vasp_outcar.py

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[codspeed-hq]

Merging this PR will improve performance by 19.79%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 2 improved benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	test_import	11.8 ms	9.6 ms	+21.91%
⚡	WallTime	test_cli	386.7 ms	328.5 ms	+17.72%

Tip

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_{Comparing njzjz-bot:fix/issue-894 (d879128) with master (0416b54)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.88%. Comparing base (0416b54) to head (d879128).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1034      +/-   ##
==========================================
+ Coverage   86.87%   86.88%   +0.01%     
==========================================
  Files          89       89              
  Lines        8266     8273       +7     
==========================================
+ Hits         7181     7188       +7     
  Misses       1085     1085              

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