refactor: rewrite code using Go 1.23 iterators

[favonia]

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[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 15 lines in your changes missing coverage. Please review.

Project coverage is 95.58%. Comparing base (11d9705) to head (d81599d).

Files with missing lines	Patch %	Lines
cmd/ddns/ddns.go	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #911      +/-   ##
==========================================
- Coverage   95.59%   95.58%   -0.02%     
==========================================
  Files          61       58       -3     
  Lines        2588     2581       -7     
==========================================
- Hits         2474     2467       -7     
  Misses        104      104              
  Partials       10       10              

Flag	Coverage Δ
unittests	95.58% <91.66%> (-0.02%)	⬇️

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