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/modules/users/views/list.component.html

@@ -0,0 +1,15 @@
+<app-page-data-list
+  [pageTitle]="'مدیریت کاربران'"
+  [addNewCtaLabel]="'افزودن کاربر جدید'"
+  [columns]="columns"
+  [showAdd]="true"
+  emptyPlaceholderTitle="کاربری یافت نشد"
+  emptyPlaceholderDescription="برای افزودن کاربر جدید، روی دکمهٔ بالا کلیک کنید."
+  [items]="[]"
+  [loading]="loading()"
+  [showDetails]="true"
+  [showAdd]="true"
+  (onAdd)="openAddForm()"
+/>
+
+<user-form [(visible)]="visibleForm" (onSubmit)="refresh()" />