fix(pipeline): distinct status for document_timeout vs failed pages

[Bojun-Vvibe]

Closes #3205

Repo

docling-project/docling

Issue

#3205

Root cause

PR #2939 made StandardPdfPipeline emit ConversionStatus.PARTIAL_SUCCESS for
both document_timeout reached and per-page failures. Downstream consumers can
no longer distinguish a truncated document (last N pages missing due to timeout)
from one where individual pages failed.

Fix

Added a new enum value ConversionStatus.PARTIAL_SUCCESS_TIMEOUT and changed
the timeout branch in StandardPdfPipeline._integrate_results to emit it.
Per-page failures continue to use PARTIAL_SUCCESS. Allow-lists in
document_converter.py and service_client/client.py accept the new status.

Regression test

tests/test_options.py::test_document_timeout updated to assert
ConversionStatus.PARTIAL_SUCCESS_TIMEOUT for both pipelines. Fails on HEAD
(returns PARTIAL_SUCCESS), passes after fix.

Risk

low

Verification

skipped: full test run requires heavy native deps (docling_core, docling_parse,
docling_ibm_models). Syntax-checked all modified files with python -m py_compile
(OK). The change is a single new enum value plus 4 surgical call-site updates.

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