fix(webserver): Set max avatar size

[boxbeam]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 53.32%. Comparing base (cad0cf4) to head (140bfd3).
Report is 1 commits behind head on main.

Files	Patch %	Lines
ee/tabby-webserver/src/service/auth.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1746      +/-   ##
==========================================
- Coverage   53.33%   53.32%   -0.02%     
==========================================
  Files         115      115              
  Lines        9781     9784       +3     
==========================================
  Hits         5217     5217              
- Misses       4564     4567       +3     

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