fix: align frontend InventoryItem type with actual API response

InventoryItemResponse returns flat fields (product_name, barcode, category)
not a nested product object. Frontend interface and templates were using
item.product.name / item.product.brand which threw TypeError on render,
blanking the inventory tab.

- InventoryItem: remove product:Product, add product_name/barcode/category
- InventoryStats: fix total_products→available_items, expired→expired_items,
  items_by_location→locations
- item IDs are int not string — update deleteItem/updateItem/consumeItem sigs
- EditItemModal, RecipesView, InventoryList: fix all item.product.xxx refs

frontend/src/components/EditItemModal.vue

@@ -10,8 +10,8 @@
         <div class="form-group">
           <label>Product</label>
           <div class="product-info">
-            <strong>{{ item.product.name }}</strong>
-            <span v-if="item.product.brand" class="brand">({{ item.product.brand }})</span>
+            <strong>{{ item.product_name || 'Unknown Product' }}</strong>
+            <span v-if="item.category" class="brand">{{ item.category }}</span>
           </div>
         </div>
 

frontend/src/components/InventoryList.vue

@@ -9,8 +9,8 @@
           <div class="stat-label">Total Items</div>
         </div>
         <div class="stat-card">
-          <div class="stat-value">{{ stats.total_products }}</div>
-          <div class="stat-label">Unique Products</div>
+          <div class="stat-value">{{ stats.available_items }}</div>
+          <div class="stat-label">Available</div>
         </div>
         <div class="stat-card expiry-soon">
           <div class="stat-value">{{ store.expiringItems.length }}</div>
@@ -263,8 +263,8 @@
             :class="getItemClass(item)"
           >
             <div class="item-header">
-              <h3 class="item-name">{{ item.product.name }}</h3>
-              <span v-if="item.product.brand" class="item-brand">{{ item.product.brand }}</span>
+              <h3 class="item-name">{{ item.product_name || 'Unknown Product' }}</h3>
+              <span v-if="item.category" class="item-brand">{{ item.category }}</span>
             </div>
 
             <div class="item-details">
@@ -485,11 +485,11 @@ async function handleSave() {
 
 async function confirmDelete(item: InventoryItem) {
   showConfirm(
-    `Are you sure you want to delete ${item.product.name}?`,
+    `Are you sure you want to delete ${item.product_name || 'item'}?`,
     async () => {
       try {
         await store.deleteItem(item.id)
-        showToast(`${item.product.name} deleted successfully`, 'success')
+        showToast(`${item.product_name || 'item'} deleted successfully`, 'success')
       } catch (err) {
         showToast('Failed to delete item', 'error')
       }
@@ -504,12 +504,12 @@ async function confirmDelete(item: InventoryItem) {
 
 async function markAsConsumed(item: InventoryItem) {
   showConfirm(
-    `Mark ${item.product.name} as consumed?`,
+    `Mark ${item.product_name || 'item'} as consumed?`,
     async () => {
       try {
         await inventoryAPI.consumeItem(item.id)
         await refreshItems()
-        showToast(`${item.product.name} marked as consumed`, 'success')
+        showToast(`${item.product_name || 'item'} marked as consumed`, 'success')
       } catch (err) {
         showToast('Failed to mark item as consumed', 'error')
       }
@@ -542,7 +542,7 @@ async function handleScannerGunInput() {
       const item = result.results[0]
       scannerResults.value.push({
         type: 'success',
-        message: `✓ Added: ${item.product.name}${item.product.brand ? ' (' + item.product.brand + ')' : ''} to ${scannerLocation.value}`,
+        message: `✓ Added: ${item.product_name || 'item'}${''} to ${scannerLocation.value}`,
       })
       await refreshItems()
     } else {
@@ -588,7 +588,7 @@ async function handleBarcodeImageSelect(e: Event) {
       const item = result.results[0]
       barcodeResults.value.push({
         type: 'success',
-        message: `✓ Found: ${item.product.name}${item.product.brand ? ' (' + item.product.brand + ')' : ''}`,
+        message: `✓ Found: ${item.product_name || 'item'}${''}`,
       })
       await refreshItems()
     } else {

frontend/src/components/RecipesView.vue

@@ -291,7 +291,7 @@ const pantryItems = computed(() => {
       if (!b.expiration_date) return -1
       return new Date(a.expiration_date).getTime() - new Date(b.expiration_date).getTime()
     })
-  return sorted.map((item) => item.product.name)
+  return sorted.map((item) => item.product_name).filter(Boolean) as string[]
 })
 
 // Grocery links relevant to a specific recipe's missing ingredients

frontend/src/services/api.ts

@@ -80,9 +80,11 @@ export interface Tag {
 }
 
 export interface InventoryItem {
-  id: string
-  product_id: string
-  product: Product
+  id: number
+  product_id: number
+  product_name: string | null
+  barcode: string | null
+  category: string | null
   quantity: number
   unit: string
   location: string
@@ -109,11 +111,10 @@ export interface InventoryItemUpdate {
 
 export interface InventoryStats {
   total_items: number
-  total_products: number
+  available_items: number
   expiring_soon: number
-  expired: number
-  items_by_location: Record<string, number>
-  items_by_status: Record<string, number>
+  expired_items: number
+  locations: Record<string, number>
 }
 
 export interface Receipt {
@@ -185,7 +186,7 @@ export const inventoryAPI = {
   /**
    * Update an inventory item
    */
-  async updateItem(itemId: string, update: InventoryItemUpdate): Promise<InventoryItem> {
+  async updateItem(itemId: number, update: InventoryItemUpdate): Promise<InventoryItem> {
     const response = await api.patch(`/inventory/items/${itemId}`, update)
     return response.data
   },
@@ -193,7 +194,7 @@ export const inventoryAPI = {
   /**
    * Delete an inventory item
    */
-  async deleteItem(itemId: string): Promise<void> {
+  async deleteItem(itemId: number): Promise<void> {
     await api.delete(`/inventory/items/${itemId}`)
   },
 
@@ -234,7 +235,7 @@ export const inventoryAPI = {
   /**
    * Mark item as consumed
    */
-  async consumeItem(itemId: string): Promise<void> {
+  async consumeItem(itemId: number): Promise<void> {
     await api.post(`/inventory/items/${itemId}/consume`)
   },
 

frontend/src/stores/inventory.ts

@@ -76,7 +76,7 @@ export const useInventoryStore = defineStore('inventory', () => {
     }
   }
 
-  async function updateItem(itemId: string, update: InventoryItemUpdate) {
+  async function updateItem(itemId: number, update: InventoryItemUpdate) {
     loading.value = true
     error.value = null
 
@@ -99,7 +99,7 @@ export const useInventoryStore = defineStore('inventory', () => {
     }
   }
 
-  async function deleteItem(itemId: string) {
+  async function deleteItem(itemId: number) {
     loading.value = true
     error.value = null