Add AuditLog table and Prisma audit extension

src/lib/server/audit-context.ts

@@ -0,0 +1,23 @@
+import { AsyncLocalStorage } from 'node:async_hooks';
+
+/**
+ * The actor for the current request, used by the Prisma audit extension to
+ * attribute database mutations. Populated in `hooks.server.ts`.
+ */
+export type AuditContext = {
+	userId: string | null;
+	email: string | null;
+	roleId: number | null;
+	page: string;
+	ip: string | null;
+};
+
+const storage = new AsyncLocalStorage<AuditContext>();
+
+export function runWithAuditContext<T>(context: AuditContext, fn: () => T): T {
+	return storage.run(context, fn);
+}
+
+export function getAuditContext(): AuditContext | undefined {
+	return storage.getStore();
+}