Fix redirect error when calling cameras/

[RonanMorgan]

Without this "/" there was a redirection to the port 80 (which was causing an error since it's not proxied)

According to this : fastapi/fastapi#9328
There is surely a proper solution if the HTTP headers are set up correctly, but I didn't succeed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.39%. Comparing base (0248df7) to head (ce7bf66).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #383   +/-   ##
=======================================
  Coverage   86.39%   86.39%           
=======================================
  Files          34       34           
  Lines         941      941           
=======================================
  Hits          813      813           
  Misses        128      128           

Flag	Coverage Δ
backend	85.99% <ø> (ø)
client	92.06% <ø> (ø)

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[frgfm]

thanks for the fix!