docs: add release usage notes

docs/RELEASE_USAGE.md

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+# Release Usage Notes / 发布包使用说明
+
+YAML Proxy Editor ships Windows installers in the repository `release/` directory. This document explains when to use each package and how to keep a local-first workflow while editing proxy configuration files.
+
+YAML Proxy Editor 在仓库 `release/` 目录中提供 Windows 安装包。本文说明不同安装包的使用场景，以及如何在编辑代理配置时保持本地优先的工作方式。
+
+## Installers / 安装包
+
+| File | Recommended Use |
+| --- | --- |
+| `YAML-Proxy-Editor-0.1.0-x64-setup.exe` | Standard Windows installation with the NSIS installer flow. |
+| `YAML-Proxy-Editor-0.1.0-x64-zh-CN.msi` | Windows Installer based deployment, especially when MSI tooling is preferred. |
+
+| 文件 | 建议用途 |
+| --- | --- |
+| `YAML-Proxy-Editor-0.1.0-x64-setup.exe` | 常规 Windows 安装，使用 NSIS 安装流程。 |
+| `YAML-Proxy-Editor-0.1.0-x64-zh-CN.msi` | 需要 Windows Installer / MSI 部署流程时使用。 |
+
+## Local-First Expectations / 本地优先边界
+
+The application is designed for local YAML editing. Users should keep these expectations in mind:
+
+应用面向本地 YAML 编辑，使用时应注意：
+
+- Local YAML files should not be uploaded automatically.
+- Network requests should be triggered by explicit user actions such as subscription refresh, provider check, or speed test.
+- Subscription URLs, credentials, and request paths should be treated as sensitive information.
+- Important production YAML files should be backed up before saving.
+
+- 本地 YAML 不应被自动上传。
+- 联网请求应由用户主动触发，例如订阅刷新、provider 检查或测速。
+- 订阅 URL、凭据和请求路径应视为敏感信息。
+- 保存重要生产配置前应保留备份。
+
+## Suggested Release Verification / 建议发布验证
+
+Before publishing a new installer, verify the project with the commands documented in `AGENTS.md` and `docs/TESTING.md`:
+
+发布新安装包前，建议按 `AGENTS.md` 和 `docs/TESTING.md` 中的命令验证：
+
+- `npm run test`
+- `npx tsc -b`
+- Rust backend tests from `src-tauri`
+- `npm run build`
+- `npm run tauri:build` when producing Windows installers
+
+A release should not be considered complete only because the frontend build succeeds. The desktop package and network-boundary behavior matter for this project.
+
+不要只因为前端构建成功就认为发布完成。该项目还需要关注桌面安装包和网络边界行为。
+
+## Troubleshooting / 常见问题
+
+### The app opens, but no YAML content is indexed
+
+Confirm the file is a Clash/OpenClash/Mihomo-compatible YAML file. If the file contains duplicate keys or invalid indentation, fix the YAML before saving.
+
+### 应用打开了，但没有识别 YAML 内容索引
+
+确认文件是 Clash/OpenClash/Mihomo 兼容 YAML。如果存在重复 key 或缩进错误，应先修正 YAML 再保存。
+
+### Subscription refresh fails
+
+Check whether the URL is trusted, reachable, and uses `http` or `https`. Avoid pasting subscription URLs into bug reports or public screenshots.
+
+### 订阅刷新失败
+
+确认 URL 可信、可访问，并且使用 `http` 或 `https`。不要把订阅 URL 粘贴到公开 issue、日志或截图中。
+
+## Related Documents / 相关文档
+
+- `docs/QUICKSTART.md`
+- `docs/BUILD.md`
+- `docs/NETWORK_POLICY.md`
+- `docs/OFFLINE_SECURITY.md`
+- `docs/TESTING.md`