Add documentation graph to README.md for module relationships

[QSchlegel]

This dependency graph visualizes the internal architecture and module relationships within the multisig wallet application.

The diagram is organized into three main architectural layers:

• Frontend Layer (pages, components, hooks): Next.js pages and React components that handle user interface and client-side logic
• Shared Layer (lib, utils, types, data, config): Shared utilities, type definitions, and configuration used across frontend and backend
• Backend Layer (server, database): API routes, authentication, database access, and business logic

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
multisig	Ready	Preview	Comment	Nov 3, 2025 3:09pm