fix(router): guard Remove against deleting entry 0 on no-match

[simpleqt]

The bug

DefaultRouter.Remove searched r.routes for the normalized path but Add stores the raw path. When they differ (e.g. e.GET("users", h) without a leading slash), rIndex stayed at 0 and r.routes[0] — a completely unrelated route — was silently deleted from the route listing while the dead entry remained.

Fix

Return nil when no matching entry is found instead of deleting r.routes[0] unconditionally.

[Copilot]

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[aldas]

but where is the test-case?

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.71%. Comparing base (dcb05f0) to head (b0f3aba).
⚠️ Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
router.go	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3097      +/-   ##
==========================================
+ Coverage   93.34%   95.71%   +2.36%     
==========================================
  Files          43       44       +1     
  Lines        4735     4036     -699     
==========================================
- Hits         4420     3863     -557     
+ Misses        192      173      -19     
+ Partials      123        0     -123     

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