Improve sanitizer warning details

[Suhaibinator]

Motivation

• The sanitizer registration warning lacked route-specific context, making it hard to identify which routes were missing a sanitizer.

Description

• Updated pkg/router/route.go to compute a methods slice and include the HTTP methods and path directly in the warning message using fmt.Sprintf and strings.Join, while still emitting structured zap fields (path and methods).

Testing

• No automated tests were run for this change.

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Codex Task

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.49%. Comparing base (41d9e05) to head (5190283).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #107   +/-   ##
=======================================
  Coverage   97.48%   97.49%           
=======================================
  Files          18       18           
  Lines        1872     1873    +1     
=======================================
+ Hits         1825     1826    +1     
  Misses         35       35           
  Partials       12       12           

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