fix: extract inference results list in UNIPipe.pipe_analyze

[MatthewZMD]

Motivation

The UNIPipe.pipe_analyze method was directly using InferenceResult objects as model lists, which caused errors in pipe_parse since it expects an iterable list of inference results. This PR fixes these errors by properly extracting the underlying list data from InferenceResult objects.

Modification

Modified UNIPipe.pipe_analyze to call get_infer_res() on the doc_analyze results before assigning them to model_list. This ensures that model_list contains the actual list of inference results rather than InferenceResult objects, which allows pipe_parse to properly iterate over and process the results.

BC-breaking (Optional)

No BC-breaking changes. This modification fixes a bug in the internal implementation without changing any public APIs or interfaces. Downstream projects will continue to work as expected.

Use cases (Optional)

This is a bug fix that resolves errors when processing PDFs through the UNIPipe pipeline. It does not introduce new features.

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects.
• CLA has been signed and all committers have signed the CLA in this PR.

Note: Tests should be added to verify:

1. pipe_analyze properly extracts inference results for both TXT and OCR modes
2. pipe_parse successfully processes the extracted results
3. The full pipeline works correctly with the modified data flow