feat: add PATCH request support, expand PATCH /users/@me, serialize enums correctly

Foxnouns.Backend/config.example.ini

@@ -4,6 +4,8 @@ Host = localhost
 Port = 5000
 ; The base *external* URL
 BaseUrl = https://pronouns.localhost
+; The base URL for media, without a trailing slash. This must be publicly accessible.
+MediaBaseUrl = https://cdn-staging.pronouns.localhost
 
 [Logging]
 ; The level to log things at. Valid settings: Verbose, Debug, Information, Warning, Error, Fatal