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/core/constants/index.ts

@@ -1,3 +1,2 @@
 export * from './defaultData.const';
 export * from './menuItems.const';
-export * from './roles.const';

src/app/core/constants/roles.const.ts

@@ -1,20 +0,0 @@
-import { TRoles } from '../models';
-
-export default {
-  ADMIN: {
-    title: 'مدیر سیستم',
-    key: 'ADMIN',
-  },
-  SCHOOL: {
-    title: 'مرکز آموزشی',
-    key: 'SCHOOL',
-  },
-  TEACHER: {
-    title: 'دبیر',
-    key: 'TEACHER',
-  },
-  STUDENTS: {
-    title: 'دانش‌آموز',
-    key: 'STUDENTS',
-  },
-} as Record<TRoles, { title: string; key: TRoles }>;