feat: replace iot adapter with mqtt command pipeline

scripts/build-backend.sh

@@ -1,5 +1,7 @@
 #!/bin/bash
 
-cd ./backend/api
-
-GOARCH=amd64 GOOS=linux go build -o ../../output/heqiapp ./cmd/main/main.go
+set -Eeuo pipefail
+mkdir -p ./output
+for module in api worker iot-client iot-server; do
+  (cd "./backend/${module}" && GOARCH=amd64 GOOS=linux go build -o "../../output/${module}" ./cmd/main/main.go)
+done