fix: correct pnpm filter name in db:backup script

The filter used `@paperclip/db` which doesn't exist — the package is
`@paperclipai/db`. This caused "No projects matched the filters".

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

scripts/backup-db.sh

@@ -13,4 +13,4 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
 
 cd "$PROJECT_ROOT"
-exec pnpm --filter @paperclip/db exec tsx src/backup.ts "$@"
+exec pnpm --filter @paperclipai/db exec tsx src/backup.ts "$@"