refactor(server/utils): create utility to return forum database's uid using the actual site's user id

lib/server/forumId.ts

@@ -0,0 +1,16 @@
+import { H3Event, EventHandlerRequest } from "h3";
+import { apiRoot } from "./constants";
+export default async function (id: number): Promise<number> {
+	let { data: lookup } = await useFetch<any>(
+		`${apiRoot}/session-sharing/lookup`,
+		{
+			method: "get",
+			query: {
+				params: {
+					id,
+				},
+			},
+		},
+	);
+	return lookup.value.uid as number;
+}