fix: refine earth hud structure and bun startup flow

- refactor the /earth HUD into class-first CSS layers with dedicated base, hud, and toolbar responsibilities
- clean up Earth markup and runtime DOM hooks so shared panel, toolbar, tooltip, and status classes stay consistent after dynamic updates
- keep HUD scaling configurable through extracted constants and remove leftover legacy panel/toolbar styling paths
- make planet.sh self-bootstrap Bun and uv by prepending local runtime bins to PATH and auto-installing missing tools in fresh environments
- document Bun as the frontend package manager of record and sync repository version metadata to 0.24.1

README.md

@@ -102,6 +102,13 @@
 | Axios | HTTP 客户端 |
 | Socket.io-client | WebSocket 客户端 |
 | ECharts | 统计图表 |
+| Bun | 前端包管理与脚本运行 |
+
+前端工程统一使用 Bun：
+
+- 安装依赖使用 `bun install`
+- 运行脚本使用 `bun run <script>`
+- 不使用 `npm`、`pnpm`、`yarn`
 
 ### 虚幻引擎客户端
 
@@ -205,6 +212,17 @@
 ./planet.sh health
 ```
 
+前端命令约定：
+
+```bash
+cd frontend
+bun install
+bun run dev
+bun run build
+```
+
+不要使用 `npm run ...`，避免在 WSL/Windows 混合环境里触发 `cmd.exe` 路径兼容问题。
+
 ## API 文档
 
 启动服务后访问: `http://localhost:8000/docs`