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

project_context.md

@@ -40,6 +40,7 @@
 - **State Management:** React Query
 - **Real-time:** Socket.io-client
 - **Charts:** ECharts
+- **Package Manager / Runner:** Bun 1
 
 ### Visualization (UE5)
 - **Engine:** Unreal Engine 5.3+
@@ -210,6 +211,8 @@ bun run build
 bun run preview
 ```
 
+前端统一使用 Bun，不使用 `npm`、`pnpm`、`yarn`。
+
 ### Docker
 ```bash
 docker-compose up -d