refactor: 对齐后端样例工程规范

backend/iot/etc/platform_iot_dev.yaml

@@ -0,0 +1,9 @@
+Service: platform-iot
+Port: 12428
+Databases:
+  Driver: postgres
+  Source:
+    - host=127.0.0.1 user=postgres password=change-me dbname=agent_dev port=5432 sslmode=disable TimeZone=Asia/Shanghai
+Cache: redis://default:change-me@127.0.0.1:6379/0
+OnMicroService: false
+SecretKey: change-me-to-a-random-string