chore(ui): add cache headers for static assets

[rbreeze]

fixes #2056

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 45.88%. Comparing base (5e2dac5) to head (9a9610c).
Report is 1 commits behind head on main.

Files	Patch %	Lines
internal/http/http.go	0.00%	5 Missing ⚠️
internal/api/server.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2097      +/-   ##
==========================================
+ Coverage   45.61%   45.88%   +0.27%     
==========================================
  Files         238      238              
  Lines       16477    16551      +74     
==========================================
+ Hits         7516     7595      +79     
+ Misses       8590     8584       -6     
- Partials      371      372       +1     

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[krancour]

LGTM