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Optimize message search FTS writes (#1970)

* fix: tune message search FTS writes

Rebuild message_search_fts with detail=column and external content, then move segment merge work to a background timer so message ingestion avoids FTS merge cost.

* chore: order schema migration exports

* fix: guard message search FTS rebuild

Avoid rebuilding optimized FTS on every startup and reapply message search retention policy after legacy backfill during migration 141.

* test: update message search handler fixture

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