convert endpoints from PHP/Symfony to C#/ASP.NET Core

talk to me (Ben) for more info.

this'll be a doozy.

if you're wondering "but why":

* C# is strongly & staticly typed, which makes many common run-time errors impossible to write
* C# has generics, which reduce the need for `object`/`mixed` and open a world of wonderful architecture possibilities
* common PHP APIs are inconsistent, less readable, and less safe than C# (everything to do with arrays, strings, unicode...)
* Doctrine & Symfony make it difficult to NOT effectively `SELECT *` your rows

Start by talking to Ben for the missing endpoint scope and migration details. The issue names PHP/Symfony as the current stack and C# as the target, but no files, tests, or specific endpoints are identified. Done would require converting the endpoints to C#/ASP.NET Core, with the exact completion criteria confirmed with the maintainer.

Written by the indexing model from the issue text.