Support for multiple clusters in a unified view

[gomesdigital]

Is your feature request related to a problem? Please describe.
We run multiple Kubernetes clusters and would like to run Trivy and Kubeclarity on them all. With the current feature set there is no way to connect the UI to multiple backends. So we have to switch browser tabs for each cluster, which becomes cumbersome as the number of clusters continue to grow.

Describe the solution you'd like
We would like to run one UI, with a dropdown used to switch between the different clusters.