chore: re-order backend file structure

apps/server/src/utils/errors.ts

@@ -0,0 +1,8 @@
+import { ConflictError } from "http-errors-enhanced";
+
+export const handleServiceError = (error: unknown) => {
+	if (error instanceof ConflictError) {
+		return { message: error.message, status: 409 as const };
+	}
+	return { message: "Internal Server Error", status: 500 as const };
+};