Seemingly Fixed
Well, it was a weird issue...
Sat down to watch nginx logs and figure this out.
Set up nginx for debugging, added a tail to nginx's error log...and the browser was able to access the server via the nginx proxy without issue. Not on my desktop or tablet, but on my phone.
Seeing that it worked there, I restarted the desktop's network-manager, cleared the browser cache of any reference to the virtual host, cleared the desktop hosts file of the commented out references to the virtual host, restarted calibre-server, restarted the tablet, and everything was coming up roses.
Honestly not 100% on what was causing the issue. I do know that I now have a much greater respect for how many different pieces make up my ebook-serving environment and how each one need to be carefully considered when doing something like this.
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