Find Dnsmasq IP leases

[jcapona]

Status	Ticket/Issue
Ready/Hold	Ticket

Main changes

• Supports finding IP leases made by dnsmasq, as this is the service that provides them in bookworm. This fixes some events that were not triggering in the web portal.

Screenshots (feature, test output, profiling, dev tools etc)

[insert screenshots here]

Other notes (e.g. implementation quirks, edge cases, questions / issues)

Manual testing tips

Tag anyone who definitely needs to review or help

[codecov]

Codecov Report

Attention: Patch coverage is 93.61702% with 3 lines in your changes missing coverage. Please review.

Project coverage is 59.21%. Comparing base (8174e8c) to head (8584b80).

Files	Patch %	Lines
packages/common/pitop/common/sys_info.py	93.61%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #647      +/-   ##
==========================================
- Coverage   59.27%   59.21%   -0.06%     
==========================================
  Files         160      160              
  Lines        7998     8033      +35     
==========================================
+ Hits         4741     4757      +16     
- Misses       3257     3276      +19     

Flag	Coverage Δ
unittests	59.21% <93.61%> (-0.06%)	⬇️

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[angusjfw]

looks good (though I didn't run it)