Refactor infrastructure scripts and add mock hardware support

Changes:
- Refactor project scripts for better dev/prod workflow separation
- Add mock_hardware.py for local development without real hardware
- Add Makefile for common commands
- Add .env.example for environment variable reference
- Split scripts into dev-backend.sh, dev-frontend.sh, prod-backend.sh
- Add stop.sh for clean shutdown

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Makefile

@@ -0,0 +1,57 @@
+.PHONY: help dev dev-backend dev-frontend stop prod install
+
+help: ## 显示帮助信息
+	@echo "=========================================="
+	@echo "  Smart Inspection DevOps"
+	@echo "=========================================="
+	@echo ""
+	@echo "本地开发命令:"
+	@echo "  make dev          显示开发模式说明"
+	@echo "  make dev-backend  启动后端 (Mock 硬件模式)"
+	@echo "  make dev-frontend 启动前端 (Next.js)"
+	@echo "  make stop         停止所有开发服务"
+	@echo ""
+	@echo "生产部署命令:"
+	@echo "  make prod         启动生产环境 (完整系统)"
+	@echo ""
+	@echo "安装命令:"
+	@echo "  make install      安装依赖"
+	@echo ""
+
+dev: ## 显示开发模式说明
+	@echo "=========================================="
+	@echo "  本地开发模式"
+	@echo "=========================================="
+	@echo ""
+	@echo "需要两个终端："
+	@echo "  终端 1: make dev-backend"
+	@echo "  终端 2: make dev-frontend"
+	@echo ""
+	@echo "或使用 tmux:"
+	@echo "  tmux new-session 'make dev-backend' \\; split-window 'make dev-frontend'"
+	@echo ""
+
+dev-backend: ## 启动后端开发服务器 (Mock 硬件模式)
+	@./scripts/dev-backend.sh
+
+dev-frontend: ## 启动前端开发服务器
+	@./scripts/dev-frontend.sh
+
+stop: ## 停止所有开发服务
+	@./scripts/stop.sh
+
+prod: ## 启动生产环境 (完整系统)
+	@echo "=========================================="
+	@echo "  生产环境启动"
+	@echo "=========================================="
+	@echo ""
+	@echo "请在 AGV 上运行此命令"
+	@echo ""
+	@./scripts/prod-backend.sh
+
+install: ## 安装依赖
+	@echo "安装 Python 依赖..."
+	@cd agv_app && uv sync
+	@echo "安装前端依赖..."
+	@cd public-frontend && npm install
+	@echo "完成"