feat(desktop): add tauri desktop client for cs.workyai.cn

desktop-client/README.md

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+# Wanwan Cloud Desktop Client
+
+Desktop client for `https://cs.workyai.cn`, built with `Tauri + Vue + TypeScript`.
+
+## Features
+- Login with existing web account
+- File list and folder navigation
+- Global search
+- Create folder / rename / delete
+- Download via backend generated direct URL
+- Persisted API server configuration (default: `https://cs.workyai.cn`)
+
+## Development
+```bash
+npm install
+npm run tauri dev
+```
+
+## Build
+```bash
+npm run tauri build
+```
+
+Windows cross build on Linux:
+```bash
+rustup target add x86_64-pc-windows-gnu
+npm run tauri build -- --target x86_64-pc-windows-gnu
+```