*: replace Split in loops with more efficient SplitSeq

[wyrapeseed]

strings.SplitSeq (introduced in Go 1.23) returns a lazy sequence (strings.Seq), allowing gopher to iterate over tokens one by one without creating an intermediate slice.

It significantly reduces memory allocations and can improve performance for long strings.

category: refactor
ticket: none

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 53.74%. Comparing base (938ab64) to head (d9e1519).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
app/eth2wrap/genwrap/genwrap.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4043      +/-   ##
==========================================
- Coverage   53.79%   53.74%   -0.06%     
==========================================
  Files         242      242              
  Lines       39412    39412              
==========================================
- Hits        21203    21183      -20     
- Misses      15967    15989      +22     
+ Partials     2242     2240       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Copilot]

Pull Request Overview

This PR replaces strings.Split with strings.SplitSeq in loop iterations to improve memory efficiency. The SplitSeq function, introduced in Go 1.23, returns a lazy sequence that allows iterating over tokens without creating an intermediate slice, reducing memory allocations.

Key Changes

• Replaced strings.Split with strings.SplitSeq in four files where the result was immediately iterated over
• Updated loop syntax from for _, item := range strings.Split(...) to for item := range strings.SplitSeq(...)

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
core/validatorapi/router.go	Updated query parameter parsing to use SplitSeq for comma-separated values
cmd/markdown_internal_test.go	Updated test file line iteration to use SplitSeq
app/log/config.go	Updated stack trace formatting to use SplitSeq for newline splitting
app/eth2wrap/genwrap/genwrap.go	Updated documentation parsing to use SplitSeq for newline splitting

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[pinebit]

Thank you @wyrapeseed for the contribution!

[wyrapeseed]

Thanks for your review.

If there's anything need I to do, please feel free to let me know.