add an endpoint to api to get an assistant by id (#1020)

src/routes/api/assistant/[id]/+server.ts

@@ -0,0 +1,17 @@
+import { collections } from "$lib/server/database";
+import { ObjectId } from "mongodb";
+
+export async function GET({ params }) {
+	const id = params.id;
+	const assistantId = new ObjectId(id);
+
+	const assistant = await collections.assistants.findOne({
+		_id: assistantId,
+	});
+
+	if (assistant) {
+		return Response.json(assistant);
+	} else {
+		return Response.json({ message: "Assistant not found" }, { status: 404 });
+	}
+}