feat: support environment variables in parsers

[wkpark]

support environment variables in parsers

Checklist

• Changes tested locally
• Code reviewed
• Documentation updated (if necessary)
• Unit tests added (if applicable)

Additional Notes

you can set environment variables for Mineru and Docling.

for example, you can set CUDA_VISIBLE_DEVICES=1 to make the parser run on a specific GPU. This prevents the parser from slowing down your main AI model on the first GPU.

# Use the second GPU (ID: 1) for this parsing task
await rag.process_document_complete(
    file_path="manual.pdf",
    env={"CUDA_VISIBLE_DEVICES": "1"}
)

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