feat: Implement category and unit selection for inventory items

- Added a new 'category' field to the InventoryItem entity and updated the database schema.
- Replaced free-text input for 'unit' and 'category' with select dropdowns in the AddItemModal.
- Introduced a new API endpoint to fetch metadata for units and categories.
- Updated inventory filtering logic to use the new 'category' field instead of 'consumable'.
- Enhanced validation for item creation and updates to ensure valid unit and category values.
- Updated tests to cover new functionality and ensure proper validation.

assets/admin/pages/InventoryPage.test.tsx

@@ -14,18 +14,20 @@ import InventoryPage from './InventoryPage';
 const get = api.get as ReturnType<typeof vi.fn>;
 
 const ITEM = {
-  uuid: 'i-1', name: 'دستکش جراحی', consumable: 'جراحی', unit: 'عدد',
+  uuid: 'i-1', name: 'دستکش جراحی', consumable: 'جراحی', category: 'لوازم مصرفی و تزریقات', unit: 'عدد',
   price: 250000, stock: 150, alertThreshold: 20, status: 'in_stock',
 };
+const META = { units: ['عدد', 'بسته', 'ویال'], categories: ['دارو', 'لوازم مصرفی و تزریقات', 'سایر'] };
 const STATS = { total: 1, low: 0, inStock: 1, outOfStock: 0 };
 const PKG = {
   uuid: 'p-1', title: 'پکیج شماره یک', total: 2400000, available: true,
   items: [{ itemUuid: 'i-1', name: 'ژل', unit: 'سی‌سی', price: 1200000, amount: 2 }],
 };
 
-function mockApi(opts: { items?: any[]; stats?: any; packages?: any[]; categories?: string[] } = {}) {
+function mockApi(opts: { items?: any[]; stats?: any; packages?: any[]; categories?: string[]; meta?: any } = {}) {
   get.mockImplementation((url: string = '') => {
     if (url.includes('/inventory-packages')) return Promise.resolve({ success: true, data: opts.packages ?? [] });
+    if (url.includes('/inventory-meta')) return Promise.resolve({ success: true, data: opts.meta ?? META });
     if (url.includes('/inventory-categories')) return Promise.resolve({ success: true, data: opts.categories ?? [] });
     if (url.includes('/inventory-items')) return Promise.resolve({ success: true, data: { items: opts.items ?? [], stats: opts.stats ?? { total: 0, low: 0, inStock: 0, outOfStock: 0 } } });
     return Promise.resolve({ success: true, data: { items: [], stats: { total: 0, low: 0, inStock: 0, outOfStock: 0 } } });
@@ -69,6 +71,21 @@ describe('InventoryPage', () => {
     expect(price.value).toBe('1,200,000');
   });
 
+  it('blocks submit when category is missing and unit is a picker, not free text', async () => {
+    mockApi({ items: [], stats: { total: 0, low: 0, inStock: 0, outOfStock: 0 } });
+    renderWithProviders(<InventoryPage />, { route: '/admin/inventory' });
+
+    fireEvent.click(await screen.findByRole('button', { name: /افزودن کالا/ }));
+    await screen.findByText('افزودن کالای جدید');
+
+    // unit is now a select — no free-text input with the old placeholder
+    expect(screen.queryByPlaceholderText('عدد')).not.toBeInTheDocument();
+
+    fireEvent.change(screen.getByPlaceholderText('نام کالا'), { target: { value: 'ماسک' } });
+    fireEvent.click(screen.getByRole('button', { name: 'اضافه کردن کالا' }));
+    expect(await screen.findByText('دسته‌بندی کالا الزامی است')).toBeInTheDocument();
+  });
+
   it('switches to the packages tab and lists a package with its price', async () => {
     mockApi({ packages: [PKG] });
     renderWithProviders(<InventoryPage />, { route: '/admin/inventory' });

assets/admin/pages/InventoryPage.tsx

@@ -14,7 +14,7 @@ type Tab = 'stock' | 'packages';
 /** انبارداری — consumable stock items + packages. Ported from clinic-pro-tauri /inventory. */
 export default function InventoryPage() {
   const {
-    items, stats, packages, categories, itemsLoading, packagesLoading,
+    items, stats, packages, categories, meta, itemsLoading, packagesLoading,
     createItem, updateItem, deleteItem, createPackage, updatePackage, deletePackage,
   } = useInventory();
 
@@ -31,7 +31,7 @@ export default function InventoryPage() {
     const q = search.trim();
     return items.filter((it) =>
       (q === '' || it.name.includes(q)) &&
-      (category === '' || it.consumable === category)
+      (category === '' || it.category === category)
     );
   }, [items, search, category]);
 
@@ -120,6 +120,7 @@ export default function InventoryPage() {
       <AddItemModal
         open={itemModal.open}
         editing={itemModal.editing}
+        meta={meta}
         saving={createItem.isPending || updateItem.isPending}
         onClose={() => setItemModal({ open: false, editing: null })}
         onSave={saveItem}