fix: update post main html new plan & unit test

[renpengli01]

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Motivation

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Modification

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BC-breaking (Optional)

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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:

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[codecov]

Codecov Report

❌ Patch coverage is 94.07895% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...actor/html/post_main_html_processer/choose_html.py	94.44%	4 Missing ⚠️
...ctor/html/post_main_html_processer/post_mapping.py	91.66%	4 Missing ⚠️
...xtractor/html/post_main_html_processer/post_llm.py	96.87%	1 Missing ⚠️

@@            Coverage Diff             @@
##              dev     #546      +/-   ##
==========================================
- Coverage   90.97%   90.97%   -0.01%     
==========================================
  Files         102      106       +4     
  Lines        8890     9159     +269     
==========================================
+ Hits         8088     8332     +244     
- Misses        802      827      +25     

Files with missing lines	Coverage Δ
...xtractor/html/post_main_html_processer/post_llm.py	87.50% <96.87%> (ø)
...actor/html/post_main_html_processer/choose_html.py	94.44% <94.44%> (ø)
...ctor/html/post_main_html_processer/post_mapping.py	91.83% <91.66%> (ø)

... and 6 files with indirect coverage changes

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[drunkpig]

源码目录下的assets需要移动到其他地方。