Adds Docker setup and basic API endpoints

WHAT: Introduces Dockerfiles for development and production, Docker Compose configurations, a Makefile for common tasks, shell scripts for environment setup/teardown, a basic Express API with SQLite integration.
WHY: Enables easy setup and deployment of the application using Docker. Provides basic API endpoints for managing purchase items.
HOW:
- Creates `docker-compose.dev.yml` and `docker-compose.prod.yml` to define services and volumes.
- Introduces `Dockerfile.dev` and `Dockerfile.prod` to build container images with necessary dependencies.
- Adds `Makefile` with commands for building, running, and managing the application.
- Implements shell scripts for simplified Docker environment management.
- Sets up Express API with endpoints for CRUD operations on purchase items, using SQLite as the database.
- Uses `better-sqlite3` to connect and interact with the SQLite database.

Makefile

@@ -17,6 +17,8 @@ NODE_MODULES = node_modules
 # 包管理器自动检测（优先 pnpm，否者回退 npm）
 PKG = $(shell command -v pnpm >/dev/null 2>&1 && echo pnpm || echo npm)
 
+# Docker（平台由 scripts/dev-up.sh 自动探测，可通过环境变量 DOCKER_PLATFORM 覆盖）
+
 # 默认目标
 .PHONY: help
 help: ## 显示帮助信息
@@ -146,5 +148,31 @@ quick-build: lint build ## 快速构建（检查代码并构建）
 test-flow: clean-install lint build preview ## 完整测试流程
 	@echo "$(GREEN)完整测试流程完成!$(RESET)"
 
+# ----- Docker 开发/生产 -----
+.PHONY: dev-up
+dev-up: ## 启动开发环境 (自动探测平台；可通过 DOCKER_PLATFORM=linux/arm64 覆盖)
+	@echo "$(GREEN)启动开发环境 (Docker)$(RESET)"
+	bash scripts/dev-up.sh
+
+.PHONY: prod-build
+prod-build: build ## 构建生产镜像 (前端在宿主机构建)
+	@echo "$(GREEN)构建生产镜像 (linux/amd64)$(RESET)"
+	bash scripts/prod-build.sh
+
+.PHONY: prod-up
+prod-up: ## 启动生产环境 (使用生产镜像)
+	@echo "$(GREEN)启动生产环境 (linux/amd64)$(RESET)"
+	bash scripts/prod-up.sh
+
+.PHONY: dev-down
+dev-down: ## 停止开发环境 (保留数据卷)
+	@echo "$(YELLOW)停止开发环境 (Docker)$(RESET)"
+	bash scripts/dev-down.sh
+
+.PHONY: prod-down
+prod-down: ## 停止生产环境 (保留数据卷)
+	@echo "$(YELLOW)停止生产环境 (Docker)$(RESET)"
+	bash scripts/prod-down.sh
+
 # 设置默认目标
 .DEFAULT_GOAL := help