fix(discovery): clarify registration consent

[nijel]

Make clear that the target URL comes from unverified request data, and render IDN hosts in ASCII so misleading Unicode domains are easier to spot.

[codecov]

Codecov Report

❌ Patch coverage is 69.23077% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.10%. Comparing base (6e0f0ef) to head (509aa1e).
⚠️ Report is 4 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4159      +/-   ##
==========================================
- Coverage   90.14%   90.10%   -0.05%     
==========================================
  Files          71       71              
  Lines       13270    13295      +25     
  Branches     1128     1130       +2     
==========================================
+ Hits        11962    11979      +17     
- Misses        931      937       +6     
- Partials      377      379       +2     

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