调整工具类的方法，优化方法调用及增加迁移工具及其用法

templates/Makefile.example

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+# 示例 Makefile
+# 提供常用的开发和部署命令
+
+.PHONY: help build run migrate-up migrate-down migrate-status docker-build docker-up clean
+
+# 默认目标：显示帮助
+help:
+	@echo "可用命令："
+	@echo "  make build          - 编译应用和迁移工具"
+	@echo "  make run            - 运行应用（先执行迁移）"
+	@echo "  make migrate-up     - 执行数据库迁移"
+	@echo "  make migrate-down   - 回滚数据库迁移"
+	@echo "  make migrate-status - 查看迁移状态"
+	@echo "  make docker-build   - 构建 Docker 镜像"
+	@echo "  make docker-up      - 启动 Docker 服务"
+	@echo "  make clean          - 清理编译文件"
+
+# 编译
+build:
+	@echo "编译应用..."
+	@mkdir -p bin
+	@go build -o bin/server cmd/server/main.go
+	@go build -o bin/migrate cmd/migrate/main.go
+	@echo "✓ 编译完成"
+
+# 运行应用
+run: migrate-up
+	@echo "启动应用..."
+	@./bin/server
+
+# 执行迁移
+migrate-up: build
+	@echo "执行数据库迁移..."
+	@./bin/migrate up
+
+# 回滚迁移
+migrate-down: build
+	@echo "回滚数据库迁移..."
+	@./bin/migrate down
+
+# 查看迁移状态
+migrate-status: build
+	@./bin/migrate status
+
+# 构建 Docker 镜像
+docker-build:
+	@echo "构建 Docker 镜像..."
+	@docker build -t myapp:latest .
+
+# 启动 Docker 服务
+docker-up:
+	@echo "启动 Docker 服务..."
+	@docker-compose up --build
+
+# 清理
+clean:
+	@echo "清理编译文件..."
+	@rm -rf bin
+	@echo "✓ 清理完成"
+
+# 开发环境：直接运行（不编译）
+dev-migrate-up:
+	@go run cmd/migrate/main.go up
+
+dev-migrate-down:
+	@go run cmd/migrate/main.go down
+
+dev-migrate-status:
+	@go run cmd/migrate/main.go status
+
+# 交叉编译（Linux）
+build-linux:
+	@echo "交叉编译 Linux 版本..."
+	@mkdir -p bin
+	@GOOS=linux GOARCH=amd64 go build -o bin/server-linux cmd/server/main.go
+	@GOOS=linux GOARCH=amd64 go build -o bin/migrate-linux cmd/migrate/main.go
+	@echo "✓ Linux 版本编译完成"
+