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>

scripts/dev-backend.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+# ============================================================
+# dev-backend.sh - 本地后端开发启动（Mock 硬件模式）
+# 用法: ./scripts/dev-backend.sh
+# 说明: 启动 Flask 后端，使用 Mock 硬件实现，无需真实硬件
+# ============================================================
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
+AGV_APP_DIR="$PROJECT_DIR/agv_app"
+
+echo "=========================================="
+echo "  本地开发模式 - Flask 后端 (Mock 硬件)"
+echo "=========================================="
+echo ""
+echo "  Mock 硬件模式已启用："
+echo "    - AGV 控制器: Mock"
+echo "    - 机械臂: Mock"
+echo "    - 摄像头: Mock"
+echo "    - Nav2 导航: Mock"
+echo ""
+echo "  访问: http://127.0.0.1:5000"
+echo "  Ctrl+C 停止"
+echo ""
+
+# 设置环境变量启用 Mock 模式
+export MOCK_HARDWARE=1
+export FLASK_PORT=5000
+
+cd "$AGV_APP_DIR"
+exec uv run --locked python app.py