Preserve legacy picture description filters

[drukpa1455]

Summary

Legacy picture-description requests can carry a local/API model config, but they currently drop the classification filter fields before those options reach Docling core.

This patch keeps the legacy path honest:

• preserve classification_allow
• preserve classification_deny
• preserve classification_min_confidence

Why

Docling core already supports classify-first-then-describe filtering.

The gap is in docling-jobkit:

• PictureDescriptionLocal and PictureDescriptionApi do not define the classification filter fields
• DoclingConverterManager later does model_dump() on those legacy models
• so the filters disappear before PictureDescriptionVlmOptions / PictureDescriptionApiOptions are built

The result in docling-serve is surprising:

• the request validates
• selective picture description appears configured
• but the filters are silently ignored

Changes

• add the three classification filter fields to PictureDescriptionLocal
• add the same fields to PictureDescriptionApi
• add regression coverage proving the legacy request path preserves those fields into the final pipeline options

Test

uv run --directory /tmp/docling-jobkit-2345 pytest tests/test_options.py -q -k 'legacy_picture_description_filters_reach_pipeline_options or legacy_picture_description_api_filters_reach_pipeline_options'

Closes #104.

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