fix: Change telegram-service from ports to expose for better network isolation

Author: mmkhak

docker-compose.yml

@@ -4,8 +4,8 @@ services:
   telegram-service:
     build: .
     container_name: telegram-service
-    ports:
-      - "8000:8000"
+    expose:
+      - 8000
     environment:
       - TELEGRAM_API_ID=${TELEGRAM_API_ID}
       - TELEGRAM_API_HASH=${TELEGRAM_API_HASH}