fix(api/comment_add): improve the security of comment add api

[qwqcode]

close #921

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 61 lines in your changes missing coverage. Please review.

Project coverage is 31.45%. Comparing base (04ef002) to head (7f684a0).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
server/handler/comment_create.go	0.00%	61 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #964      +/-   ##
==========================================
- Coverage   31.50%   31.45%   -0.05%     
==========================================
  Files         204      204              
  Lines        8707     8711       +4     
==========================================
- Hits         2743     2740       -3     
- Misses       5811     5818       +7     
  Partials      153      153              

Flag	Coverage Δ
go	31.45% <0.00%> (-0.05%)	⬇️

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