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### What problem does this PR solve?
This PR addresses **two independent issues** encountered when using the
MinerU engine in Ragflow:
1. **MinerU API output path mismatch for non-ASCII filenames**
MinerU sanitizes the root directory name inside the returned ZIP when
the original filename contains non-ASCII characters (e.g., Chinese).
Ragflow's client-side unzip logic assumed the original filename stem and
therefore failed to locate `_content_list.json`.
This PR adds:
* root-directory detection
* fallback lookup using sanitized names
* a broadened `_read_output` search with a glob fallback
ensuring output files are consistently located regardless of filename
encoding.
2. **Chunker crash due to tuple-structure mismatch in manual mode**
Some parsers (e.g., MinerU / Docling) return **2-tuple sections**, but
Ragflow’s chunker expects **3-tuple sections**, leading to:
`ValueError: not enough values to unpack (expected 3, got 2)`
This PR normalizes all sections to a uniform structure `(text, layout,
positions)`:
* parse position tags when present
* default to empty positions when missing
preserving backward compatibility and preventing crashes.
### Type of change
* [x] Bug Fix (non-breaking change which fixes an issue)
[#11136](https://github.com/infiniflow/ragflow/issues/11136)
[#11700](https://github.com/infiniflow/ragflow/issues/11700)
[#11620](https://github.com/infiniflow/ragflow/issues/11620)
[#11701](https://github.com/infiniflow/ragflow/pull/11701)
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Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>