chore: initial project scaffold

Sets up monorepo with Wails desktop shell, Go backend, React/TS frontend, and Kotlin Android SDK skeleton.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend-react/src/main.tsx

@@ -0,0 +1,10 @@
+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App.tsx'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)