docs: 在 README 中前置新手提示和 2.0 商业版介绍

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

README.md

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 > 📖 **[完整教程](https://u-claw.org/tutorial.html)** — 从零开始的手工安装指南、模型配置、聊天平台接入，小白也能看懂。
 
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+> ⚠️ **新手提示：** 本仓库为开源 1.0 版本，构建需要一定的技术基础（Node.js / 命令行 / 脚本）和编程工具，不建议零基础用户贸然下载自行折腾。**想省事的话，推荐直接购买商业版（2.0）**，开箱即用，无需折腾。
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+> 🚀 **2.0 商业版** 是全面升级版，包含 U 盘内运行的**本地模型**（离线可用，无需联网 API），更多端侧 AI 能力持续迭代。我们也在搭建**端侧 AI 落地社区**，便携式端侧 AI 还很小众，但这是未来——我们致力于成为便携式端侧 AI 的中国领跑者。欢迎联系交流合作：微信 **hecare888**
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 ### 一键安装（推荐）
 
 不需要 U 盘，一行命令直接装到电脑：
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 > 📖 **[Full Tutorial](https://u-claw.org/tutorial.html)** — Step-by-step manual installation, model setup, chat platform integration.
 
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+> ⚠️ **Heads up for beginners:** This repo is the open-source 1.0 version. Building it requires technical knowledge (Node.js / CLI / scripting). If you just want something that works out of the box, **we recommend purchasing the commercial 2.0 edition** instead — no setup hassle.
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+> 🚀 **Version 2.0 (commercial)** is a major upgrade featuring **on-device local models** that run entirely inside the USB drive — no internet or API key required. We're also building an **edge AI community** in China. Portable edge AI is still niche, but it's the future — and we're building the leading platform for it. Reach us on WeChat: **hecare888**
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 ### One-Line Install (Recommended)
 
 No USB needed — install directly to your computer: