feat: change default machine inventory sorting to stock fill rate (ascending)

app/Http/Controllers/Admin/WarehouseController.php

@@ -573,7 +573,8 @@ class WarehouseController extends Controller
     {
         $query = Machine::with(['slots' => fn($q) => $q->with('product:id,name,image_url')->orderByRaw('CAST(slot_no AS UNSIGNED) ASC')])
             ->withCount('slots as total_slots')
-            ->withSum('slots as total_stock', 'stock');
+            ->withSum('slots as total_stock', 'stock')
+            ->withSum('slots as total_capacity', 'max_stock');
 
         if ($search = $request->input('search')) {
             $query->where(function ($q) use ($search) {
@@ -582,7 +583,9 @@ class WarehouseController extends Controller
             });
         }
 
-        $machines = $query->orderBy('name')
+        // 預設按庫存率由低到高排序 (補貨優先)，在庫存率相同時再按名稱排序
+        $machines = $query->orderByRaw('CASE WHEN total_capacity > 0 THEN (total_stock / total_capacity) ELSE 1 END ASC')
+            ->orderBy('name')
             ->paginate($request->input('per_page', 10))
             ->withQueryString();