feat(db): SearchMediaItemsUnifiedRow carries abridged + audio_metadata

The unified search row lagged the table (survey overstated it —
narrators was already there). Both columns come from the
already-scanned media_items side of the joins: EXPLAIN before/after is
plan-identical (same Nested Loop shape, no new scans). Row-completeness
only — no client surface changes; the hand maps select their own keys.

internal/database/queries/queries.sql

@@ -658,6 +658,8 @@ SELECT
   mi.tags_search,
   mi.contributors_search,
   mi.narrators,
+  mi.abridged,
+  mi.audio_metadata,
   mi.file_sha256,
   mi.opf_identifier,
   mi.opf_uuid,