feat(ui, gateway): integrate admin dashboard with vite multi-app

[luannmoreira]

Description

This PR introduces support for Enterprise Instance Dashboard in the project's original UI repository by integrating a multi-app setup using Vite. The changes ensure that both the standard and enterprise versions of the Admin Dashboard can coexist seamlessly.

Changes

• Updated vite.config to support building two projects.
• Modified vitest.config to unify test configurations for both projects.
• Added the full source code for the instance administration dashboard.
• Updated the gateway configuration to allow both UI instances to run simultaneously.

How to Test

Build & Run

1. Verify that both UI instances build successfully using Vite.
2. Ensure that the correct UI is served based on the URL.

e.g:

https://localhost/ will serve the community instance
https://localhost/admin will serve only routes to the Dashboard

Run Tests

1. Execute tests with Vitest and confirm that they run without conflicts.

eg:

$ ./bin/docker-compose exec ui /bin/sh to enter the UI container
run $ npm run test

Validate Gateway Behavior

1. Ensure that the gateway correctly routes requests to the appropriate UI instance.

Additional Notes

This update is critical for supporting enterprise deployments while maintaining compatibility with the existing UI and maintaining the same version of node modules.