feat: Implement initial setup service for admin user creation

- Added `SetupService` to handle the generation and validation of setup tokens.
- Integrated setup token generation during application startup if no admin users exist.
- Created API endpoints for checking setup status and completing the initial setup.
- Updated `AuthService` to include functionality for creating the initial admin user.
- Enhanced error handling for setup and authentication processes.
- Added frontend components for login and protected routes.
- Implemented Zustand store for managing authentication state.
- Updated Vite configuration to check setup status and serve the setup page if required.
- Documented the initial setup process in `setup.md`.

crates/nxmesh-master/Cargo.toml

@@ -74,6 +74,9 @@ uuid.workspace = true
 # Templating
 handlebars.workspace = true
 
+# Random generation
+rand = "0.8"
+
 [dev-dependencies]
 tokio-test.workspace = true
 mockall.workspace = true