feat: 修复获取文本未保留换行问题、增加段落文本的测试用例

[LollipopsAndWine]

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Motivation

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Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

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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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@            Coverage Diff             @@
##              dev     #297      +/-   ##
==========================================
+ Coverage   89.70%   89.87%   +0.16%     
==========================================
  Files          82       82              
  Lines        5556     5559       +3     
==========================================
+ Hits         4984     4996      +12     
+ Misses        572      563       -9     

Files with missing lines	Coverage Δ
llm_web_kit/extractor/html/recognizer/text.py	100.00% <100.00%> (+0.84%)	⬆️

... and 4 files with indirect coverage changes

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