FPrime GDS - Provide a Base URL/ Root URL option so that its easy to reverse proxy FPrime GDS

F´ Version
Affected Component	GDS

Feature Request: Configurable Base URL for GDS

Currently, FPrime's Ground Data System (GDS) can only run at a root URL (e.g., localhost:5000). This makes managing multiple FPrime instances challenging, requiring users to remember and track individual port numbers.

It would be helpful if GDS allowed specifying an arbitrary base URL (e.g., localhost/fprime-gds-2). This capability would simplify management of multiple GDS instances and facilitate use behind reverse proxies, similar to Grafana's root URL option. This is especially useful in a dockerized setup/as part of CI/CD pipelines.