fix(ui): use route-prefix in api requests

[JosephKav]

Was always using /api/v1 as the API url, ignoring any route-prefix the app may have.
Now we add getBasename() to that url.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.82%. Comparing base (cf82aa0) to head (ea0f4b0).
⚠️ Report is 20 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #694   +/-   ##
=======================================
  Coverage   98.82%   98.82%           
=======================================
  Files         132      132           
  Lines        8890     8890           
=======================================
  Hits         8785     8785           
  Misses         80       80           
  Partials       25       25           

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