feat: allow saving and rendering of HTML with relative path images

[LIlGG]

What type of PR is this?

/kind feature

What this PR does / why we need it:

在渲染评论 HTML 及保存 HTML 内容时允许包含相对路径的图片。

这是评论支持上传媒体文件的相关 PR。

see halo-dev/plugin-comment-widget#205

Does this PR introduce a user-facing change?

None

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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Details

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.07%. Comparing base (42c374d) to head (1f194de).
⚠️ Report is 381 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8177      +/-   ##
============================================
+ Coverage     59.55%   61.07%   +1.51%     
- Complexity     3812     3991     +179     
============================================
  Files           677      695      +18     
  Lines         23248    23766     +518     
  Branches       1500     1550      +50     
============================================
+ Hits          13846    14514     +668     
+ Misses         8764     8512     -252     
- Partials        638      740     +102     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud