http server: fall back to base process HTTP binding if unbound path is requested

[dr-frmr]

Problem

As suggested here, it would be better for developer experience if unbound HTTP subpaths beneath a process-path (like mynode.com/chess:distro:sys/asdf) would default to the behavior of the base path (/chess:distro:sys/ in this case).

Solution

In the HTTP server module, add a fallback if a path is not recognized that matches on the process ID and a root path (/) binding.

We need to keep the overall behavior as-is because every path-structure (which can have URL params, etc) should be possible to configure (whether it's local-only, authenticated, etc). But for many apps, such as ones that use react router to serve 'pages', it's convenient to bind the root path once and let everything resolve to that.

Testing

1. navigate to unbound subpaths in an app
2. navigate to bound subpaths, ensure those work

Docs Update

N/A

Notes

Test this on release candidate