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/utils/formatting.ts

@@ -0,0 +1,39 @@
+/**
+ * Formatting utilities
+ */
+
+/**
+ * Format a blockchain address for display
+ * @param address - Full blockchain address
+ * @param chars - Number of characters to show at start and end
+ * @returns Formatted address (e.g., "0x1234...5678")
+ */
+export function formatAddress(address: string, chars = 4): string {
+  if (!address) return '';
+  if (address.length <= chars * 2) return address;
+  return `${address.slice(0, chars)}...${address.slice(-chars)}`;
+}
+
+/**
+ * Format a number with thousand separators
+ * @param value - Number to format
+ * @param decimals - Number of decimal places
+ * @returns Formatted number string
+ */
+export function formatNumber(value: number, decimals = 2): string {
+  return new Intl.NumberFormat('en-US', {
+    minimumFractionDigits: decimals,
+    maximumFractionDigits: decimals,
+  }).format(value);
+}
+
+/**
+ * Format a token amount with proper decimals
+ * @param amount - Amount in smallest unit
+ * @param decimals - Token decimals (e.g., 18 for most tokens)
+ * @returns Formatted token amount
+ */
+export function formatTokenAmount(amount: string | number, decimals = 18): string {
+  const value = typeof amount === 'string' ? parseFloat(amount) : amount;
+  return formatNumber(value / Math.pow(10, decimals), 4);
+}