Add System tests

[gilesknap]

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[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 81.51%. Comparing base (2909ac1) to head (49b8ae1).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/usb_remote/server.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #32       +/-   ##
===========================================
+ Coverage   63.37%   81.51%   +18.13%     
===========================================
  Files          12       12               
  Lines         942      952       +10     
===========================================
+ Hits          597      776      +179     
+ Misses        345      176      -169     

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