fix: update singleplayer add signature to card

packages/lib/server-only/recipient/get-recipient-signatures.ts

@@ -0,0 +1,15 @@
+import { prisma } from '@documenso/prisma';
+
+export type GetRecipientSignaturesOptions = {
+  recipientId: number;
+};
+
+export const getRecipientSignatures = async ({ recipientId }: GetRecipientSignaturesOptions) => {
+  return await prisma.signature.findMany({
+    where: {
+      Field: {
+        recipientId,
+      },
+    },
+  });
+};