chore(mail): remove nestjs-i18n, only ever used for the two mail templates

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

myteamwallet_backend/src/app.module.ts

@@ -6,12 +6,9 @@ import authConfig from './config/auth.config';
 import appConfig from './config/app.config';
 import mailConfig from './config/mail.config';
 import fileConfig from './config/file.config';
-import * as path from 'path';
 import { MailerModule } from '@nestjs-modules/mailer';
-import { ConfigModule, ConfigService } from '@nestjs/config';
+import { ConfigModule } from '@nestjs/config';
 import { TypeOrmModule } from '@nestjs/typeorm';
-import { I18nModule } from 'nestjs-i18n/dist/i18n.module';
-import { HeaderResolver } from 'nestjs-i18n';
 import { TypeOrmConfigService } from './database/typeorm-config.service';
 import { MailConfigService } from './mail/mail-config.service';
 import { ForgotModule } from './forgot/forgot.module';
@@ -45,23 +42,6 @@ import { PenaltyModule } from './penalty/penalty.module';
     MailerModule.forRootAsync({
       useClass: MailConfigService,
     }),
-    I18nModule.forRootAsync({
-      useFactory: (configService: ConfigService) => ({
-        fallbackLanguage: configService.get('app.fallbackLanguage'),
-        loaderOptions: { path: path.join(__dirname, '/i18n/'), watch: true },
-      }),
-      resolvers: [
-        {
-          use: HeaderResolver,
-          useFactory: (configService: ConfigService) => {
-            return [configService.get('app.headerLanguage')];
-          },
-          inject: [ConfigService],
-        },
-      ],
-      imports: [ConfigModule],
-      inject: [ConfigService],
-    }),
     ServeStaticModule.forRoot({
       rootPath: join(__dirname, '../client'),
       exclude: ['*/api*'],