Feature: Parse and store multi-input values

1. I allowed configuration of multi inputs, to set the min and max values/length of number/text inputs
2. I parsed and stored the values on the backend, so they are now available to the virtual server

I need to:

1. Allow updating configuration after creation
2. Figure out how to implement a reverse proxy with variable subdomains to expose ports

1. Configure multiinputs
2. Add parsing + storage