Add Desktop App src/ Structure and Integration Guide (#179)

[KanavCode]

The guide documents Contains :

1. The purpose and responsibilities of main modules (main.ts, preload.ts)
2. IPC handler organization and usage (ipc/)
3. AI module structure and integration (ai/)
4. Database setup and management (db/)
5. How the desktop app integrates with Core and API modules
6. Additional noteworthy directories and best practices for development

[vercel]

@KanavCode is attempting to deploy a commit to the vailabel Team on Vercel.

A member of the Team first needs to authorize it.