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.

pezkuwi-sdk-ui/README.md

@@ -0,0 +1,26 @@
+# Pezkuwi SDK UI
+
+**Status:** 🚧 Planned - Not yet implemented
+
+This directory will contain the Polkadot SDK UI clone, branded for Pezkuwi.
+
+## Planned Features
+
+- Frontend and backend interface based on Polkadot SDK
+- Full branding for Pezkuwichain
+- Integration with pezkuwichain.app
+- Comprehensive blockchain explorer and interaction tools
+
+## Implementation Plan
+
+1. Clone the official Polkadot.js Apps repository
+2. Customize branding (logos, colors, naming)
+3. Configure for Pezkuwi blockchain endpoint
+4. Add custom features specific to Pezkuwi
+5. Deploy to pezkuwichain.app
+
+## Resources
+
+- [Polkadot.js Apps](https://github.com/polkadot-js/apps)
+- [Substrate Front-end Template](https://github.com/substrate-developer-hub/substrate-front-end-template)
+- Pezkuwi Chain Specs: `../web/src/components/ChainSpecs.tsx`