refactor: 对齐后端样例工程规范

backend/api/Makefile

@@ -0,0 +1,21 @@
+.PHONY: build run cli migrate lint tidy
+
+build:
+	go build -o build/platform-api ./cmd/main/main.go
+	go build -o build/platform-cli ./cmd/cli/main.go
+
+run:
+	go run ./cmd/main/main.go
+
+cli:
+	go run ./cmd/cli/main.go $(ARGS)
+
+migrate:
+	go run ./cmd/cli/main.go migrate
+
+lint:
+	go vet ./...
+	go fmt ./...
+
+tidy:
+	go mod tidy