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/constants/index.ts

@@ -0,0 +1,34 @@
+/**
+ * Shared constants for Pezkuwi Web App Projects
+ */
+
+/**
+ * Application version
+ */
+export const APP_VERSION = '1.0.0';
+
+/**
+ * Supported languages
+ */
+export const SUPPORTED_LANGUAGES = [
+  { code: 'en', name: 'English' },
+  { code: 'tr', name: 'Türkçe' },
+  { code: 'kmr', name: 'Kurdî' },
+  { code: 'ckb', name: 'سۆرانی' },
+  { code: 'ar', name: 'العربية' },
+  { code: 'fa', name: 'فارسی' },
+] as const;
+
+/**
+ * Default language
+ */
+export const DEFAULT_LANGUAGE = 'en';
+
+/**
+ * API timeouts (in milliseconds)
+ */
+export const TIMEOUTS = {
+  API_REQUEST: 30000,
+  BLOCKCHAIN_QUERY: 60000,
+  TRANSACTION: 120000,
+} as const;