refactor: 对齐后端样例工程规范

backend/api/scripts/build.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -euo pipefail
+mkdir -p build
+GOARCH=amd64 GOOS=linux go build -o ./build/platform-api ./cmd/main/main.go
+GOARCH=amd64 GOOS=linux go build -o ./build/platform-cli ./cmd/cli/main.go

backend/api/scripts/lint.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+set -euo pipefail
+go vet ./...
+go fmt ./...