Settings System (#46)

* feat(api): settings system

Also includes /auth/me endpoint for ticket ch76 and OpenAPI 3.0 compatibility for ch77

* refactor(api): remove unused imports

server/middleware/auth.ts

@@ -1,6 +1,5 @@
 import { getRepository } from 'typeorm';
 import { User } from '../entity/User';
-import { Middleware } from '../types/express';
 
 export const checkUser: Middleware = async (req, _res, next) => {
   if (req.session?.userId) {