feat: Configure environment variables, refactor onboarding conversation states, and expose database port in Docker Compose.

docker-compose.yml

@@ -1,4 +1,4 @@
-version: '3.8'
+version: "3.8"
 
 services:
   bot:
@@ -25,6 +25,8 @@ services:
       MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
     volumes:
       - mysql_data:/var/lib/mysql
+    ports:
+      - "3306:3306"
 
 volumes:
   mysql_data: