Fix Prisma JSON typing in V1 actions

src/lib/admin-actions.ts

@@ -3,6 +3,7 @@
 import { randomBytes } from "node:crypto";
 import { revalidatePath } from "next/cache";
 import { redirect } from "next/navigation";
+import { Prisma } from "@prisma/client";
 import { prisma } from "./prisma";
 import { requireCurrentUser, userIsAdmin } from "./session";
 
@@ -86,7 +87,7 @@ export async function revokeInvite(formData: FormData) {
   revalidateAdmin();
 }
 
-async function audit(actorId: string, action: string, metadata: Record<string, unknown>) {
+async function audit(actorId: string, action: string, metadata: Prisma.InputJsonObject) {
   await prisma.auditEvent.create({ data: { actorId, action, metadata } });
 }