feat(user email setting): added field to save user email

fix #122

server/interfaces/api/userSettingsInterfaces.ts

@@ -2,6 +2,7 @@ import { NotificationAgentKey } from '../../lib/settings';
 
 export interface UserSettingsGeneralResponse {
   username?: string;
+  email?: string;
   discordId?: string;
   locale?: string;
   region?: string;

server/routes/user/usersettings.ts

@@ -51,6 +51,7 @@ userSettingsRoutes.get<{ id: string }, UserSettingsGeneralResponse>(
 
       return res.status(200).json({
         username: user.username,
+        email: user.email,
         discordId: user.settings?.discordId,
         locale: user.settings?.locale,
         region: user.settings?.region,