Add richer catalog metadata for sample songs

[Jamesllllllllll]

Summary

Add richer catalog metadata fields to catalog_songs and backfill the 35 demo songs with the extra Ignition data we need for exact matching and future filtering work.

What Changed

• added new catalog_songs columns for artist_id, author_id, grouped_project_id, richer tuning IDs, and JSON metadata for tags/genres/subgenres
• updated the catalog upsert path so these new fields persist during sync/import work
• added a sample metadata source file for the 35 demo songs and a script to regenerate data/sample-catalog.sql
• added a new migration 0003_catalog_metadata_enrichment.sql
• added a safer sample-catalog seed script that handles existing rows and works around the FTS update trigger issue during backfill
• updated the remote-operation helper to use the new seed script

How To Test

1. Run npm run db:migrate.
2. Run npm run db:seed:sample:local.
3. Verify catalog_songs now has populated artist_id, author_id, tuning ID fields, and JSON metadata columns for the sample songs.
4. Run npm run lint and npm run typecheck.

Notes

• I already applied the remote D1 migration and metadata backfill using the generated production Wrangler config.
• Verified remote catalog_songs still has 35 rows and the new metadata columns are populated.

[github-actions]

Preview deployment updated.

App: https://request-bot-pr-21.jameskeezer.workers.dev
Frontend worker: request-bot-pr-21
Backend worker: request-bot-backend-pr-21