增加mathjax渲染器作用的范围

[1041206149]

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[codecov]

Codecov Report

❌ Patch coverage is 86.20690% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...xtractor/html/recognizer/cc_math/render/mathjax.py	77.77%	2 Missing ⚠️
llm_web_kit/extractor/html/recognizer/ccmath.py	89.47%	2 Missing ⚠️

@@            Coverage Diff             @@
##              dev     #520      +/-   ##
==========================================
+ Coverage   90.96%   90.97%   +0.01%     
==========================================
  Files         102      102              
  Lines        8866     8889      +23     
==========================================
+ Hits         8065     8087      +22     
- Misses        801      802       +1     

Files with missing lines	Coverage Δ
...extractor/html/recognizer/cc_math/render/render.py	89.13% <100.00%> (+0.11%)	⬆️
...xtractor/html/recognizer/cc_math/render/mathjax.py	90.04% <77.77%> (-0.48%)	⬇️
llm_web_kit/extractor/html/recognizer/ccmath.py	91.30% <89.47%> (+1.43%)	⬆️

... and 1 file with indirect coverage changes

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[1041206149]

会出现没有渲染器，但是渲染器标记开启的情况，所以取消这个断言

[e06084]

1. 建议增加一个MathRenderType=MATHJAX_MOCK的类继承MathJaxRender来支持这种情况。写一下这个类的说明；
2. 加一个测试用例；