feat: add product management features and integrate role selection

- Added PRODUCTS_ROUTES to app routing.
- Removed roles.const.ts and related references to central-auth-roles.
- Updated login component to remove role selection logic.
- Integrated ToastService for success notifications in customer, inventory, product brand, product category, supplier, and user forms.
- Implemented product and category selection fields in product form.
- Created reusable select components for product brands and categories.
- Enhanced user form with password validation and role selection.
- Established roles service for fetching roles from the API.

src/app/modules/auth/pages/login/login.component.ts

@@ -16,7 +16,7 @@ import { Password } from 'primeng/password';
 import { ProgressSpinnerModule } from 'primeng/progressspinner';
 import { RadioButtonModule } from 'primeng/radiobutton';
 import { CaptchaService } from 'src/app/core/services/captcha.service';
-import { CENTRAL_AUTH_ROLES } from '../../constants/central-auth-roles.const';
+// import { CENTRAL_AUTH_ROLES } from '../../constants/central-auth-roles.const';
 
 @Component({
   selector: 'app-login',
@@ -56,14 +56,14 @@ export class LoginComponent {
   readonly isCaptchaExpired = this.captchaService.captchaIsExpired;
   readonly isCaptchaLoading = this.captchaService.loading;
   readonly captchaImageSrc = this.captchaService.captchaImageSrc;
-  readonly centralAuthRoles = CENTRAL_AUTH_ROLES;
+  // readonly centralAuthRoles = CENTRAL_AUTH_ROLES;
 
   readonly loginForm = this.fb.group({
     username: ['', [Validators.required]],
     password: ['', [Validators.required]],
     rememberMe: [false],
     captcha: ['', [Validators.required]],
-    role: [this.defaultRole || this.centralAuthRoles[0].key, [Validators.required]],
+    role: [this.defaultRole, [Validators.required]],
   });
 
   selectedRole = signal<TRoles>('SCHOOL');