Document front workbench setup

RuoYi-Vue/easycode-web/README.md

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+# EasyCode Web
+
+独立前台生成工作台，面向前台用户完成项目草稿创建、AI 数据库设计、表结构编辑、项目结构预览和代码预览。
+
+## Start
+
+```powershell
+npm install
+npm run dev
+```
+
+Default URL: `http://localhost:5174`
+
+## Backend
+
+Set `VITE_API_BASE_URL` in `.env.development`.
+
+The dev server proxies `/front/**` to the backend. The backend default URL is `http://localhost:8080`.
+
+## Flow
+
+1. Register or login front user.
+2. Enter project name and description.
+3. Generate MySQL database design through backend DeepSeek service.
+4. Edit tables and fields.
+5. Preview backend, frontend, and admin frontend project files.
+
+## Build
+
+```powershell
+npm run build
+```
+
+Node.js `>=20` is required by the Vite toolchain.