docs: 添加 Milk-V Duo (256M) LED Blink 插件使用案例

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概述

本 PR 在「插件使用案例」分类下新增了 case3：Milk-V Duo (256M) LED Blink：使用 RuyiSDK 示例完成外设开发。

内容说明

本案例演示了如何利用插件中的 RuyiSDK 示例 功能，找到 Milk-V Duo (256M) 开发板的 LED Blink 示例，并通过插件的包管理、虚拟环境和源码解包能力，完成从查找示例到板载 LED 闪烁的完整开发流程。

主要步骤包括：

1. 通过 RuyiSDK 示例（Home 面板或命令面板
   uyi.board-docs\）查找 LED Blink 示例
2. 安装 gnu-plct 工具链
3. 创建 milkv-duo 虚拟环境
4. 通过 Extract RuyiSDK Package 解包 milkv-duo-examples 源码
5. 编译 LED 闪烁程序
6. 传输到开发板并运行
7. 恢复系统原有 LED 功能

与现有案例的区别

案例	开发板	示例	侧重
case1	LicheePi 4A	CoreMark	构建流程
case2	Milk-V Duo (64M)	构建与调试	构建与远程调试
case3（本 PR）	Milk-V Duo (256M)	LED Blink	RuyiSDK 示例功能 + 外设开发

本案例的特色：

• 首个以 RuyiSDK 示例功能 为入口的案例，展示从示例面板查找和阅读文档的完整流程
• 首个 外设交互 案例（GPIO LED 闪烁），区别于纯软件构建
• Milk-V Duo (256M) 是搭载 SG2002 芯片的升级版，与 case2 的 64M 版本（CV1800B）为不同型号

参考来源

• 示例文档参考 board-docs Duo_256m/blink
• 插件功能参考 RuyiSDK 示例文档

Summary by Sourcery

Documentation:

• Document a step-by-step Milk-V Duo (256M) LED Blink workflow leveraging RuyiSDK examples, package management, virtual environments, and source extraction.

[sourcery-ai]

Reviewer's Guide

Adds a new VSCode plugin usage case document (case3) describing how to use the RuyiSDK Examples feature with a Milk-V Duo (256M) board to build and run an LED blink demo end-to-end, including toolchain setup, virtual environment, source extraction, build, deployment, and cleanup.

Flow diagram for Milk-V Duo LED Blink development using RuyiSDK Examples

flowchart TD
    Dev[Developer] --> VSCode[VSCode RuyiSDK_Extension]

    VSCode --> Home[Open Ruyi Home and RuyiSDK Examples]
    Home --> SelectBoard[Select MilkV_Duo_256M Blink example]

    VSCode --> Packages[Install gnu_plct toolchain]
    VSCode --> Venv[Create milkv_duo virtual_environment]

    VSCode --> Extract[Extract RuyiSDK_Package milkv_duo_examples]
    Extract --> Source[Local blink source directory]

    Source --> Build[Build blink with riscv64_plct_linux_gnu_gcc]
    Build --> Binary[Blink binary]

    Binary --> SCP[scp to board 192_168_42_1]
    SCP --> Board[MilkV_Duo_256M board]

    Board --> DisableSysBlink[Disable system blink_sh and reboot]
    DisableSysBlink --> RunBlink[Run ./blink and observe LED]
    RunBlink --> RestoreSysBlink[Restore blink_sh and reboot]

Loading

File-Level Changes

Change	Details	Files
Document a new Milk-V Duo (256M) LED Blink end-to-end workflow using the RuyiSDK VSCode plugin examples feature.	Introduce a new case3 markdown page under VSCode-Plugins/cases with sidebar metadata for navigation ordering. Describe prerequisites for using the RuyiSDK VSCode extension with a Milk-V Duo (256M) board on the same network. Detail step-by-step usage of the Ruyi: Home and RuyiSDK Examples panels (and ruyi.board-docs command) to locate and read the Blink example for Milk-V Duo (256M). Explain installing the gnu-plct toolchain via the Packages view and creating/activating a milkv-duo virtual environment bound to that toolchain. Describe extracting the milkv-duo-examples package via Extract RuyiSDK Package and building the blink sample with riscv64-plct-linux-gnu-gcc using the proper include and library paths. Provide instructions for copying the compiled binary to the board via scp, running it over SSH, temporarily disabling the system LED script to avoid conflicts, and later restoring the default LED behavior. Add remarks clarifying board model differences (Duo 256M vs 64M) and optional Copilot / QEMU usage from the examples panel.	VSCode-Plugins/cases/case3.md

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="VSCode-Plugins/cases/case3.md" line_range="11" />
<code_context>
+
+## 前置条件
+
+- 已安装 RuyiSDK VSCode 扩展（如未安装，可在 VSCode 扩展市场搜索 RuyiSDK 安装）
+- 已连接互联网（RuyiSDK 示例功能需要网络）
+- 已准备 Milk-V Duo (256M) 开发板，并已完成系统启动（参考 [Milk-V Duo 官方文档](https://milkv.io/zh/docs/duo/getting-started/boot)）
</code_context>
<issue_to_address>
**nitpick (typo):** 可以考虑将“VSCode”统一改为官方写法“VS Code”以保持专有名词拼写规范。

文中多处出现“VSCode”（包括本行和“在 VSCode 中打开”按钮）。建议统一改为“VS Code”以与微软官方写法保持一致，是否采纳可按团队约定决定。

Suggested implementation:

```
- 已安装 RuyiSDK VS Code 扩展（如未安装，可在 VS Code 扩展市场搜索 RuyiSDK 安装）

```

文档中其它位置若存在“VSCode”（例如按钮文案“在 VSCode 中打开”等），也应统一替换为“VS Code”，包括：
1. 普通文本中出现的“VSCode”。
2. UI 按钮、菜单项等出现的“VSCode”。
请在整个文档和相关翻译/配置文件中搜索“VSCode”并统一替换为“VS Code”，以保持专有名词拼写一致。
</issue_to_address>

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[sourcery-ai]

nitpick (typo): 可以考虑将“VSCode”统一改为官方写法“VS Code”以保持专有名词拼写规范。

文中多处出现“VSCode”（包括本行和“在 VSCode 中打开”按钮）。建议统一改为“VS Code”以与微软官方写法保持一致，是否采纳可按团队约定决定。

Suggested implementation:

- 已安装 RuyiSDK VS Code 扩展（如未安装，可在 VS Code 扩展市场搜索 RuyiSDK 安装）

文档中其它位置若存在“VSCode”（例如按钮文案“在 VSCode 中打开”等），也应统一替换为“VS Code”，包括：

1. 普通文本中出现的“VSCode”。
2. UI 按钮、菜单项等出现的“VSCode”。
   请在整个文档和相关翻译/配置文件中搜索“VSCode”并统一替换为“VS Code”，以保持专有名词拼写一致。