chore(docker): expose postgres port in debug environment

Map host port 50001 to container port 5432 in docker-compose.debug.yml
Allows direct database access during local debugging

docker-compose.debug.yml

@@ -7,6 +7,8 @@ services:
       POSTGRES_PASSWORD: pokopia
     volumes:
       - postgres18_data:/var/lib/postgresql
+    ports:
+      - "50001:5432"
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U pokopia -d pokopia"]
       interval: 5s