feat(server): email notifications (#8447)

* feat(server): add `react-mail` as mail template engine and `nodemailer`

* feat(server): add `smtp` related configs to `SystemConfig`

* feat(web): add page for SMTP settings

* feat(server): add `react-email.adapter`

This adapter render the React-Email into HTML and plain/text email.
The output is set as the body of the email.

* feat(server): add `MailRepository` and `MailService`

Allow to use the NestJS-modules-mailer module to send SMTP emails.
This is the base transport for the `NotificationRepository`

* feat(server): register the job dispatcher and Job for async email

This allows to queue email sending jobs for the `EmailService`.

* feat(server): add `NotificationRepository` and `NotificationService`

This act as a middleware to properly route the notification to the right transport.
As POC I've only implemented a simple SMTP transport.

* feat(server): add `welcome` email template

* feat(server): add the first notification on `createUser` in `UserService`

This trigger an event for the `NotificationRepository` that once processes
by using the global config and per-user config will carry the payload to the right notification transport.

* chore: clean up

* chore: clean up web

* fix: type errors"

* fix package lock

* fix mail sending, option to ignore certs

* chore: open api

* chore: clean up

* remove unused import

* feat: email feature flag

* chore: remove unused interface

* small styling

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>
Co-authored-by: Daniel Dietzler <mail@ddietzler.dev>
Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

server/src/cores/system-config.core.ts

@@ -61,6 +61,7 @@ export const defaults = Object.freeze<SystemConfig>({
     [QueueName.MIGRATION]: { concurrency: 5 },
     [QueueName.THUMBNAIL_GENERATION]: { concurrency: 5 },
     [QueueName.VIDEO_CONVERSION]: { concurrency: 1 },
+    [QueueName.NOTIFICATION]: { concurrency: 5 },
   },
   logging: {
     enabled: true,
@@ -145,6 +146,20 @@ export const defaults = Object.freeze<SystemConfig>({
     externalDomain: '',
     loginPageMessage: '',
   },
+  notifications: {
+    smtp: {
+      enabled: false,
+      from: '',
+      replyTo: '',
+      transport: {
+        ignoreCert: false,
+        host: '',
+        port: 587,
+        username: '',
+        password: '',
+      },
+    },
+  },
   user: {
     deleteDelay: 7,
   },
@@ -162,6 +177,7 @@ export enum FeatureFlag {
   PASSWORD_LOGIN = 'passwordLogin',
   CONFIG_FILE = 'configFile',
   TRASH = 'trash',
+  EMAIL = 'email',
 }
 
 export type FeatureFlags = Record<FeatureFlag, boolean>;
@@ -243,6 +259,7 @@ export class SystemConfigCore {
       [FeatureFlag.OAUTH_AUTO_LAUNCH]: config.oauth.autoLaunch,
       [FeatureFlag.PASSWORD_LOGIN]: config.passwordLogin.enabled,
       [FeatureFlag.CONFIG_FILE]: !!process.env.IMMICH_CONFIG_FILE,
+      [FeatureFlag.EMAIL]: config.notifications.smtp.enabled,
     };
   }