refactor(modular): 完成第二階段儀表板解耦與模型清理

app/Modules/Inventory/Contracts/InventoryServiceInterface.php

@@ -40,6 +40,14 @@ interface InventoryServiceInterface
      */
     public function getProductsByIds(array $ids);
 
+    /**
+     * Search products by name.
+     * 
+     * @param string $name
+     * @return \Illuminate\Support\Collection
+     */
+    public function getProductsByName(string $name);
+
     /**
      * Get a specific product by ID.
      * 
@@ -97,4 +105,11 @@ interface InventoryServiceInterface
      * @return void
      */
     public function decreaseInventoryQuantity(int $inventoryId, float $quantity, ?string $reason = null, ?string $referenceType = null, $referenceId = null);
+
+    /**
+     * Get statistics for the dashboard.
+     * 
+     * @return array
+     */
+    public function getDashboardStats(): array;
 }