feat(plugins): Add smartmail, mailauth and uuid to Deno dependencies and export them from plugins; include local dev permissions file

ts/mail/delivery/placeholder.ts

@@ -0,0 +1,8 @@
+/**
+ * Placeholder delivery implementation
+ * This will be replaced with actual delivery logic
+ */
+
+export class DeliveryPlaceholder {
+  // Placeholder for delivery functionality
+}