Add comments field for images and improve documentation

[hv0905]

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[codecov]

Codecov Report

Attention: Patch coverage is 96.84211% with 3 lines in your changes missing coverage. Please review.

Project coverage is 84.51%. Comparing base (0f242b1) to head (0d9ee76).

Files	Patch %	Lines
app/Services/vector_db_context.py	88.23%	2 Missing ⚠️
app/Services/upload_service.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
+ Coverage   84.45%   84.51%   +0.05%     
==========================================
  Files          36       36              
  Lines        1364     1369       +5     
==========================================
+ Hits         1152     1157       +5     
  Misses        212      212              

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[codeclimate]

Code Climate has analyzed commit 0c3a34d and detected 0 issues on this pull request.

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