dashboard: auth fixes, guild listing, config editing

src/api/responses.ts

@@ -0,0 +1,13 @@
+import { Response } from "express";
+
+export function unauthorized(res: Response) {
+  res.status(403).json({ error: "Unauthorized" });
+}
+
+export function clientError(res: Response, message: string) {
+  res.status(400).json({ error: message });
+}
+
+export function ok(res: Response) {
+  res.json({ result: "ok" });
+}