feat: map OCR text-layer skip option

[drukpa1455]

Summary

This maps Docling's new service request option into OCR engine options:

ConvertDocumentsOptions(ocr_skip_text_layer_pages=True)

When present, jobkit passes skip_text_layer_pages=True into the selected OCR options. The mapper reads the field with getattr(..., False) so this remains compatible with the current released Docling package until docling-project/docling#3465 is released.

Related to docling-project/docling#3464 and docling-project/docling#3465.

Validation

• uv run ruff check docling_jobkit/convert/manager.py tests/test_pipeline_options_translation.py
• uv run pytest tests/test_pipeline_options_translation.py
• git diff --check

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