Optimize React Router Setup for Improved Performance and Scalability

### Description

### Description:

Refactor the React Router configuration to:

* Group related routes into logical modules for better organization and maintainability.
* Implement lazy loading for all route components to enable code splitting and reduce initial bundle size.
* Add a centralized error route to handle unmatched paths with proper redirection or error display.
* Ensure the routing setup supports easy scalability for future feature additions.

This optimization will improve app load times, simplify route management, and enhance overall code quality.

### Acceptance Criteria:

* [ ] Routes are organized into separate modules based on feature areas (e.g., auth, KYC, QR scanning).
```code
📁 src
├── 📁 layouts
│ └── AppLayout.tsx # Main layout component that wraps pages and renders nested routes
├── 📁 router
│ ├── index.tsx # Main router setup, combines all route groups into a single router
│ └── 📁 routes # Folder containing grouped route definitions by feature area
│ ├── authRoutes.ts
│ ├── kycRoutes.ts
│ ├── qrRoutes.ts
│ ├── coreRoutes.ts
│ └── errorRoutes.ts
````
* [ ] All route components are loaded lazily with dynamic imports.
* [ ] A global fallback UI is displayed during lazy loading of components.
* [ ] A catch-all error route properly handles unmatched URLs by redirecting or showing a 404 page.
* [ ] Route configuration is scalable and easy to extend with new routes.
* [ ] No regressions in navigation or page rendering behavior after refactor.

### Suggested Subtasks:

1. **Modularize routes:** Separate route definitions into multiple files grouped by feature.
2. **Implement lazy loading:** Convert all route components to use dynamic imports with lazy loading.
3. **Add global fallback:** Implement a global loading indicator that shows while components load.
4. **Configure error route:** Add a catch-all route to handle 404s gracefully.
5. **Test routing:** Verify all routes render correctly and lazy loading works as expected.
6. **Documentation:** Update routing docs with the new structure and guidelines.