feat: Implement product categories, stores, suppliers, and users management features

- Added ProductCategoriesService for handling product category API interactions.
- Created components for listing and viewing product categories.
- Implemented UI for managing product categories with a data list component.
- Developed StoresService for managing store-related API calls.
- Created components for listing and viewing stores with appropriate UI.
- Added SuppliersService for handling supplier API interactions.
- Implemented components for managing suppliers with a data list component.
- Developed UsersService for managing user-related API calls.
- Created components for listing and viewing users with appropriate UI.
- Enhanced not found page with improved layout and navigation options.

src/app/uikit/uikit-emptystate.component.html

@@ -1,6 +1,6 @@
 <div class="flex flex-col items-center justify-center py-12 text-center bg-surface-overlay">
   <ng-container>
-    <i [class]="icon + ' !text-6xl mb-4 text-surface-500'" aria-hidden="true"></i>
+    <i [class]="icon + '!text-6xl mb-4 text-surface-500'" aria-hidden="true"></i>
   </ng-container>
   <span class="text-xl font-semibold mb-2 text-surface-500">{{ title }}</span>
   @if (description) {