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

STYLE.md

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+# Code style
+
+## C# code style
+
+Code should be formatted with `dotnet format` or Rider's built-in formatter.  
+Variables should *always* be declared using `var`, unless the correct type
+can't be inferred from the declaration (i.e. if the variable needs to be an
+`IEnumerable<T>` instead of a `List<T>`, or if a variable is initialized as `null`).
+
+## TypeScript code style
+
+Use `prettier` for formatting the frontend code.