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.

shared/blockchain/index.ts

@@ -0,0 +1,10 @@
+/**
+ * Blockchain utilities and helpers
+ *
+ * This module provides common blockchain interaction utilities
+ * that can be used across web and mobile applications.
+ */
+
+export * from './polkadot';
+
+// Add more blockchain utility exports as needed

shared/blockchain/polkadot.ts

@@ -0,0 +1,32 @@
+/**
+ * Polkadot/Substrate blockchain utilities
+ */
+
+import type { BlockchainNetwork } from '../types/blockchain';
+
+/**
+ * Pezkuwi blockchain network configuration
+ */
+export const PEZKUWI_NETWORK: BlockchainNetwork = {
+  name: 'Pezkuwi',
+  endpoint: 'wss://pezkuwichain.app:9944',
+  chainId: 'pezkuwi',
+};
+
+/**
+ * Common blockchain endpoints
+ */
+export const BLOCKCHAIN_ENDPOINTS = {
+  pezkuwi: 'wss://pezkuwichain.app:9944',
+  local: 'ws://127.0.0.1:9944',
+} as const;
+
+/**
+ * Get block explorer URL for a transaction
+ * @param txHash - Transaction hash
+ * @returns Block explorer URL
+ */
+export function getExplorerUrl(txHash: string): string {
+  // Update with your actual block explorer URL
+  return `https://explorer.pezkuwichain.app/tx/${txHash}`;
+}