fix: replace deprecated *ngIf with @if control flow in OTP component

- Migrated all *ngIf directives to modern @if syntax in otp.component.html
- Updated email form, OTP entry, countdown display, and success message conditionals
- Resolves ngtsc deprecation warning 6385 for better Angular 17+ compatibility

src/app/app.routes.ts

@@ -1,3 +1,6 @@
 import { Routes } from '@angular/router';
+import { OtpComponent } from './auth/otp/otp.component';
 
-export const routes: Routes = [];
+export const routes: Routes = [
+    { path: '**', pathMatch: 'full', component: OtpComponent }
+];