Fix highlight with infinity

[yuzhichang]

Fix highlight with infinity
Fix on OpenSUSE Tumbleweed

Type of change

• Bug Fix (non-breaking change which fixes an issue)

[Copilot]

Pull Request Overview

This PR fixes highlighting functionality with the Infinity database on OpenSUSE Tumbleweed by enhancing text highlighting logic to handle both English and non-English content, along with several code style improvements.

• Enhanced highlight functionality to properly detect and handle existing highlighted text
• Added language-specific highlighting logic for English vs non-English text
• Updated PyICU dependency version and added OpenSUSE installation instructions

Reviewed Changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
rag/utils/infinity_conn.py	Enhanced highlighting logic, added language detection, code style improvements
pyproject.toml	Updated PyICU dependency to version 2.15.3
download_deps.py	Removed commented argparse dependency
deepdoc/parser/pdf_parser.py	Added math import
README.md	Added OpenSUSE installation instructions and improved formatting

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