Fix DB auth: local-only Postgres, install password defaults

docker-compose.yml

@@ -9,8 +9,9 @@ services:
       POSTGRES_DB: ${POSTGRES_DB:-vpnpanel}
     volumes:
       - pgdata:/var/lib/postgresql/data
-    ports:
-      - "5432:5432"
+    # БД только внутри Docker-сети, с интернета недоступна
+    expose:
+      - "5432"
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U ${POSTGRES_USER:-vpnpanel} -d ${POSTGRES_DB:-vpnpanel}"]
       interval: 5s
@@ -26,6 +27,12 @@ services:
     volumes:
       - .:/work
     entrypoint: ["/app/install"]
+    environment:
+      POSTGRES_HOST: postgres
+      POSTGRES_PORT: "5432"
+      POSTGRES_USER: ${POSTGRES_USER:-vpnpanel}
+      POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-changeme}
+      POSTGRES_DB: ${POSTGRES_DB:-vpnpanel}
     depends_on:
       postgres:
         condition: service_healthy