[FIX] 優化庫存輸入邏輯與數值處理

1. 在 MachineController 中加入庫存數值強制轉型邏輯，確保後端驗證前已處理字串數值（如 "01" 轉為 1）。
2. 在遠端庫存調整介面中，為 Alpine.js 的 x-model 加入 .number 修飾符，強化前端資料類型一致性。

app/Http/Controllers/Admin/MachineController.php

@@ -164,6 +164,11 @@ class MachineController extends AdminController
      */
     public function updateSlotExpiry(Request $request, Machine $machine)
     {
+        // 確保庫存數值為整數，處理如 "01" 轉為 1 的情況
+        if ($request->has('stock') && !is_null($request->stock) && $request->stock !== '') {
+            $request->merge(['stock' => (int) $request->stock]);
+        }
+
         $validated = $request->validate([
             'slot_no' => 'required|integer',
             'stock' => 'nullable|integer|min:0',

resources/views/admin/remote/stock.blade.php

@@ -219,7 +219,11 @@
                     const csrf = document.querySelector('meta[name="csrf-token"]').getAttribute('content');
                     const res = await fetch(`/admin/machines/${this.selectedMachine.id}/slots/expiry`, {
                         method: 'POST',
-                        headers: { 'Content-Type': 'application/json', 'X-CSRF-TOKEN': csrf },
+                        headers: { 
+                            'Content-Type': 'application/json', 
+                            'Accept': 'application/json',
+                            'X-CSRF-TOKEN': csrf 
+                        },
                         body: JSON.stringify({
                             slot_no: this.selectedSlot.slot_no,
                             ...this.formData
@@ -727,7 +731,7 @@
                             <div
                                 class="flex items-center gap-4 bg-slate-50 dark:bg-slate-900/50 p-5 rounded-2xl border border-slate-100 dark:border-slate-800/50">
                                 <div class="flex-1">
-                                    <input type="number" x-model="formData.stock" min="0"
+                                    <input type="number" x-model.number="formData.stock" min="0"
                                         :max="selectedSlot ? selectedSlot.max_stock : 99"
                                         class="w-full bg-transparent border-none p-0 text-5xl font-black text-slate-800 dark:text-white focus:ring-0 placeholder-slate-200">
                                     <div class="text-sm font-black text-slate-400 mt-2 uppercase tracking-wider pl-0.5">