fix: preserve surface POSCAR input paths

[njzjz-bot]

Fixes #1912.

Summary:

• Pass the complete from_poscar_path to pymatgen when creating surface supercells.
• Exercise the surface workflow with a POSCAR stored outside the working directory.

Validation:

• PYTHONPATH=/home/jzzeng/codes/dpgen python -m unittest tests.data.test_gen_surf_poscar -v
• ruff check dpgen/data/surf.py tests/data/test_gen_surf_poscar.py
• ruff format --check dpgen/data/surf.py tests/data/test_gen_surf_poscar.py

This replaces #1931 solely to use the requested njzjz-bot submitter account. The head commit is unchanged.

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 d5ce577 and 5f92f5e.

📒 Files selected for processing (2)

• dpgen/data/surf.py
• tests/data/test_gen_surf_poscar.py

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