feat: setup plunk for transactional/marketing emails

packages/email/src/cloudMailerClient.tsx

@@ -0,0 +1,8 @@
+import Plunk from "@plunk/node";
+
+export const cloudMailerClient =
+  process.env.NEXT_PUBLIC_KAN_ENV === "cloud"
+    ? new Plunk(process.env.PLUNK_API_KEY ?? "", {
+        baseUrl: process.env.PLUNK_API_URL,
+      })
+    : null;