feat: Implement email service with welcome, password reset, and verification templates, and add application logo.

src/app.module.ts

@@ -9,6 +9,7 @@ import { configuration } from './config';
 import { PrismaModule } from './prisma';
 import { AuthModule, JwtAuthGuard, RolesGuard } from './auth';
 import { UsersModule } from './users';
+import { EmailModule } from './email';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
 
@@ -41,6 +42,7 @@ import { AppService } from './app.service';
     // Feature Modules
     AuthModule,
     UsersModule,
+    EmailModule,
   ],
   controllers: [AppController],
   providers: [