feat: add FreeCAD-aligned web CAD frontend baseline

README.md

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+# Web FreeCAD BitBybit
+
+FreeCAD-aligned web CAD frontend baseline for the BitBybit runtime boundary.
+
+## Current scope
+
+- React + Vite frontend shell
+- FreeCAD-style application menus, workbench navigation, Combo View, Task Dock, viewport and Report view
+- Machine-readable workbench and command manifest in `src/freecadManifest.ts`
+- Chinese implementation plan in `docs/web-cad-implementation-plan.zh-CN.md`
+
+The current milestone is a static interface prototype. Real BitBybit Facade, FreeCAD/OCCT WASM, Three.js geometry, SQLite WASM and OPFS persistence are scheduled for the following integration milestones.
+
+## Development
+
+```bash
+npm install
+npm run dev
+```
+
+Build verification:
+
+```bash
+npm run build
+```