Freegle / Iznik / 27871

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master: 72%

Pull #1122

circleci

feat(matched): one-click relevantallowed opt-out + reach-exact matching

Implements the two Future Improvements from this PR.

Targeted opt-out (Future 1):
- apiv2 GET|POST /user/relevantoff?u=&k= sets relevantallowed=0,
  key-authenticated by the user's users_logins Link key — a one-click
  List-Unsubscribe (RFC 8058) and footer link that stop ONLY these
  suggestion emails, not the whole account.
- LoginLinkService mints/reuses the Link key; MatchedPosts points its
  List-Unsubscribe header and a visible footer link at the endpoint.
- Also fixes a latent gap: MatchedPosts was missing configureMessage(),
  so it had no X-Freegle-* tracking or List-Unsubscribe headers at all.

Reach-exact (Future 2):
- MatchedPostsService::verifyReach keeps a shown match only if it is in
  apiv2's matchesForPost for the recipient's OWN matched post (which
  reach-filters against that post's owner). Direction (i) is free;
  direction (ii) costs one extra apiv2 call per surviving recipient post,
  dropping matches that haven't rippled out instead of mailing on bbox
  proximity.

Tests: 3 Go relevantoff cases; LoginLinkService get-or-create; a
reach-drop service case + updated fixtures; integration assertions for
the opt-out link + List-Unsubscribe header. Go 3526 + Laravel 4865 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013YqwEGSmzjUbHM3QinYAxX

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