Reorganize repository into monorepo structure

Restructured the project to support multiple frontend applications:
- Move web app to web/ directory
- Create pezkuwi-sdk-ui/ for Polkadot SDK clone (planned)
- Create mobile/ directory for mobile app development
- Add shared/ directory with common utilities, types, and blockchain code
- Update README.md with comprehensive documentation
- Remove obsolete DKSweb/ directory

This monorepo structure enables better code sharing and organized
development across web, mobile, and SDK UI projects.

web/src/main.tsx

@@ -0,0 +1,14 @@
+import { createRoot } from 'react-dom/client'
+import App from './App.tsx'
+import './index.css'
+import './i18n/config'
+
+// Add window.ethereum type declaration
+declare global {
+  interface Window {
+    ethereum?: any;
+  }
+}
+
+// All providers are now in App.tsx for better organization
+createRoot(document.getElementById("root")!).render(<App />);