feat: add invoice notification settings and email notifications for payments

- Introduced a new feature allowing users to enable or disable invoice email notifications in the billing settings.
- Implemented email notifications for successful invoice payments and payment failures, enhancing user communication regarding billing.
- Updated the database schema to include a new column for storing user preferences on invoice notifications.
- Added corresponding email templates for invoice notifications and payment failure alerts.

These changes improve user experience by keeping users informed about their billing status and actions required.

packages/server/src/utils/notifications/utils.ts

@@ -19,6 +19,7 @@ export const sendEmailNotification = async (
 	connection: typeof email.$inferInsert,
 	subject: string,
 	htmlContent: string,
+	attachments?: { filename: string; content: Buffer }[],
 ) => {
 	try {
 		const {
@@ -41,6 +42,7 @@ export const sendEmailNotification = async (
 			subject,
 			html: htmlContent,
 			textEncoding: "base64",
+			attachments,
 		});
 	} catch (err) {
 		console.log(err);