fix: scan backfills release type metadata onto pre-existing rows

MonitoredRelease rows created before an artist's discography was
populated (e.g. an owned album recorded before _populate_discography
ran) never got primaryType/secondaryTypes backfilled, wrongly
excluding them from the studio-only core view. _populate_discography
now DO UPDATEs the MB type metadata on conflict instead of DO NOTHING,
leaving monitored/state/currentQualityClass/firstGrabbedAt untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

worker/lyra_worker/scan.py

@@ -53,7 +53,11 @@ def _populate_discography(conn, browser, watched_id, artist_mbid: str, artist_na
                 'INSERT INTO "MonitoredRelease" (id, "watchedArtistId", "artistMbid", "artistName", '
                 '"rgMbid", album, "primaryType", "secondaryTypes", "firstReleaseDate", monitored, state, "createdAt") '
                 "VALUES (gen_random_uuid()::text, %s, %s, %s, %s, %s, %s, %s, %s, false, 'wanted', now()) "
-                'ON CONFLICT ("rgMbid") DO NOTHING',
+                'ON CONFLICT ("rgMbid") DO UPDATE SET '
+                '  "primaryType" = EXCLUDED."primaryType", '
+                '  "secondaryTypes" = EXCLUDED."secondaryTypes", '
+                '  "firstReleaseDate" = EXCLUDED."firstReleaseDate", '
+                '  "watchedArtistId" = COALESCE("MonitoredRelease"."watchedArtistId", EXCLUDED."watchedArtistId")',
                 (watched_id, artist_mbid, artist_name, rg.rg_mbid, rg.title, rg.primary_type or None,
                  list(rg.secondary_types), rg.first_release_date or None),
             )