wcp: sysd token validation

[BeryJu]

cc @speedbooster

• migrate token validation from jwt-cpp to system service via rust FFI
• better logging (SPDLOG_DEBUG gives us line numbers in the log file)
• Fix package using the wrong paths to register stuff

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.24%. Comparing base (2064f0b) to head (06d1336).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #402   +/-   ##
=====================================
  Coverage   3.24%   3.24%           
=====================================
  Files        130     130           
  Lines       4283    4283           
=====================================
  Hits         139     139           
  Misses      4137    4137           
  Partials       7       7           

Flag	Coverage Δ
go-macos-15	3.10% <ø> (ø)
go-ubuntu-24.04	2.87% <ø> (ø)
go-ubuntu-24.04-arm	2.85% <ø> (ø)
go-windows-2025	3.28% <ø> (ø)

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[github-actions]

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