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Pull #1122

circleci

feat(matched): resurrect matched-posts email with vector matching

For each recently-arrived Offer/Wanted, email the poster the opposite-type
posts near them that match, and the owners of matched posts the new arrival.
Rebuilds V1 cron/relevant.php on the vector embeddings.

- apiv2 GET /message/{id}/matches: opposite-type vector matches near a post,
  reach-filtered against the post owner (batch calls unauthenticated).
  Killswitch FEATURE_MATCHED_POSTS.
- matches:notify command, scheduled every 10 min, arrival-driven (~100 posts
  /run on prod). One vector search per fresh post feeds both directions.
- Adaptive MjmlMailable (hero for one match, list for several) with a
  "matches your wanted/offer" reason line, reusing shared chrome + tracking.
- Never re-mails: per-(msgid,userid) ledger messages_matched_notified; skips
  posts already clicked to view (messages_likes View + pageview=1); ~4h
  per-user cooldown; honours relevantallowed opt-out; excludes own/taken/
  deleted/unapproved posts.

Separate from the digest relevance ranking (PR #956), left untouched.

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

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