chore: sync submodule state (parent ref update)

Made-with: Cursor

backend/api/rest/cmd/main.go

@@ -8,15 +8,15 @@ import (
 	"time"
 
 	"github.com/explorer/backend/api/rest"
-	"github.com/explorer/backend/database/config"
+	pgconfig "github.com/explorer/backend/libs/go-pgconfig"
 	"github.com/jackc/pgx/v5/pgxpool"
 )
 
 func main() {
 	ctx := context.Background()
 	
-	// Load database configuration
-	dbConfig := config.LoadDatabaseConfig()
+	// Load database configuration (reusable lib: libs/go-pgconfig)
+	dbConfig := pgconfig.LoadDatabaseConfig()
 	poolConfig, err := dbConfig.PoolConfig()
 	if err != nil {
 		log.Fatalf("Failed to create pool config: %v", err)