fix: connect to postgres db for database existence check

docker-entrypoint.sh

@@ -17,7 +17,7 @@ for i in $(seq 1 15); do
 done
 
 # Create database
-/usr/lib/postgresql/15/bin/psql -h 127.0.0.1 -p 5432 -tc "SELECT 1 FROM pg_database WHERE datname='starry_omr'" | grep -q 1 || \
+/usr/lib/postgresql/15/bin/psql -h 127.0.0.1 -p 5432 -d postgres -tc "SELECT 1 FROM pg_database WHERE datname='starry_omr'" | grep -q 1 || \
   /usr/lib/postgresql/15/bin/createdb -h 127.0.0.1 -p 5432 starry_omr
 
 # ── Model path resolution from models.yaml ──