fix: 去除compose中重复声明

.env.example

@@ -28,9 +28,9 @@ REDIS_HOST=redis
 REDIS_DATABASE=0
 
 # === RabbitMQ Configuration ===
-RABBITMQ_HOST=rabbitmq
-RABBITMQ_USERNAME=openisle
-RABBITMQ_PASSWORD=openisle_password
+RABBITMQ_HOST=localhost
+RABBITMQ_USERNAME=guest
+RABBITMQ_PASSWORD=guest
 
 # === Backend Application Secrets ===
 JWT_SECRET=change-me-jwt-secret