Freegle / Iznik / 6096

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feat: digest reply notice + unified digest improvements

- Add DigestReplyNotice mailable with MJML/AMP templates: auto-response when
  users reply to a digest, explaining how to reply to specific posts
- Handle digest replies in IncomingMailService and MailParserService: detect
  X-Freegle-Email-Type: UnifiedDigest header and dispatch reply notice
- UnifiedDigest: add digest_number to tracking metadata, store sent digest
  in users_digests table for reply-to correlation
- UnifiedDigestService: body-similarity deduplication (same key but different
  body treated as distinct post), bodiesMatch() + normalizeBody() helpers
- fix(test): PostcodeRemapServiceTest use NULL groupid/userid to avoid FK
  constraint failures (groups and users tables empty in test DB)

All 1664 Laravel tests pass.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

8898 of 10275 branches covered (86.6%)

Branch coverage included in aggregate %.

61336 of 98462 relevant lines covered (62.29%)

10.42 hits per line