fix: join caddy external network, use expose instead of ports

Caddy reaches FPM via Docker network (pp-planer-app:9000) instead of
host port mapping. Removed broken app-public named volume.

docker-compose.yml

@@ -28,12 +28,11 @@ services:
       - ./:/app
       - /app/node_modules
       - /app/vendor
-    ports:
-      - "9000:9000"
+    expose:
+      - "9000"
     networks:
-      - pp-planer-network
-    depends_on:
-      - node
+      - caddy
+      - internal
 
   node:
     image: node:20-alpine
@@ -45,14 +44,13 @@ services:
     volumes:
       - ./:/app
       - /app/node_modules
-    ports:
-      - "5173:5173"
+    expose:
+      - "5173"
     networks:
-      - pp-planer-network
+      - caddy
+      - internal
     command: sh -c "npm install && npm run dev"
 
-  # Optional: SQLite database service (for reference, SQLite runs in-process)
-  # For MySQL, uncomment and configure:
   # mysql:
   #   image: mysql:8.0
   #   container_name: pp-planer-mysql
@@ -64,14 +62,11 @@ services:
   #     MYSQL_USER: ${DB_USERNAME}
   #   volumes:
   #     - mysql_data:/var/lib/mysql
-  #   ports:
-  #     - "3306:3306"
   #   networks:
-  #     - pp-planer-network
+  #     - internal
 
 networks:
-  pp-planer-network:
+  caddy:
+    external: true
+  internal:
     driver: bridge
-# volumes:
-#   mysql_data:
-#     driver: local