refactor: use range-over-integer loops

[zxysilent]

Use Go's range-over-integer syntax where the index is either needed directly or not used. This simplifies the loops without changing behavior.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.42%. Comparing base (01b45be) to head (574f1b5).
⚠️ Report is 32 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3042      +/-   ##
==========================================
+ Coverage   93.17%   93.42%   +0.24%     
==========================================
  Files          43       43              
  Lines        4501     4730     +229     
==========================================
+ Hits         4194     4419     +225     
- Misses        189      190       +1     
- Partials      118      121       +3     

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