Fix redirects for non-ASCII request paths

[sanketio]

Description of the Change

sanitize_text_field() on REQUEST_URI stripped percent-encoded octets, so non-ASCII paths (e.g. /轉址/, /café/) never matched. Non-ASCII octets are now decoded before sanitizing and in match_redirect(); rules stored encoded still match, and %2F/%3F stay encoded.

Closes #442

How to test the Change

1. Create a redirect from /轉址/ to /.
2. Visit /轉址/ → redirected to the homepage (302, X-Safe-Redirect-Manager: true).
3. npm run test:php

Changelog Entry

Fixed - Redirects for URLs containing non-ASCII characters, such as Chinese or accented letters.

Credits

Props @sanketio, @oecin

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.