[FIX] 修正 IoT 管理介面分頁持久化與實作 B055 遠端出貨 API

1. 視圖持久化優化：將 index/stock 視圖切換從 x-if 改為 x-show，解決 HSSelect 在切換分頁後失效的問題。
2. 變數存取安全：為所有 selectedMachine 屬性存取補上可選鏈 (?.) 保護，防止 x-show 模式下的 null 錯誤。
3. UI 體驗提升：放大「指令中心」與「庫存管理」歷史紀錄的時間字體至 15px 並加粗顯示。
4. API 功能實作：在 routes/api.php 與 MachineController 中實作 B055 遠端指令出貨控制端點。
5. 文件同步：更新 SKILL.md 技術規格文件，明確定義 B055 的請求與回應格式。
6. 樣式調整：修改 app.css 優化奢華風 UI 字體與間距細節。

app/Http/Controllers/Api/V1/App/MachineController.php

@@ -145,6 +145,114 @@ class MachineController extends Controller
             'status' => $status
         ], 202); // 202 Accepted
     }
+    
+    /**
+     * B055: Get Remote Dispense Queue (POST/GET)
+     * 用於獲取雲端下發的遠端出貨指令詳情。
+     */
+    public function getDispenseQueue(Request $request)
+    {
+        $machine = $request->get('machine');
+
+        // 查找該機台狀態為「已發送 (sent)」且類型為「出貨 (dispense)」的最新指令
+        $command = \App\Models\Machine\RemoteCommand::where('machine_id', $machine->id)
+            ->where('command_type', 'dispense')
+            ->where('status', 'sent')
+            ->latest()
+            ->first();
+
+        if (!$command) {
+            return response()->json([
+                'success' => true,
+                'code' => 200,
+                'data' => []
+            ]);
+        }
+
+        // 映射 Java APP 預期格式: res1 = ID, res2 = SlotNo
+        return response()->json([
+            'success' => true,
+            'code' => 200,
+            'data' => [
+                [
+                    'res1' => (string) $command->id,
+                    'res2' => (string) ($command->payload['slot_no'] ?? ''),
+                ]
+            ]
+        ]);
+    }
+
+    /**
+     * B055: Report Remote Dispense Result (PUT)
+     * 用於機台回報遠端出貨執行的最終結果。
+     */
+    public function reportDispenseResult(Request $request, \App\Services\Machine\MachineService $machineService)
+    {
+        $commandId = $request->input('id');
+        $type = $request->input('type'); // 通常為 0
+        $stockReported = $request->input('stock'); // 機台回報的剩餘庫存
+
+        $command = \App\Models\Machine\RemoteCommand::find($commandId);
+
+        if (!$command) {
+            return response()->json([
+                'success' => false,
+                'code' => 404,
+                'message' => 'Command not found'
+            ], 404);
+        }
+
+        // 更新指令狀態 (0 代表成功)
+        $status = ($type == '0') ? 'success' : 'failed';
+        
+        $payloadUpdates = [
+            'reported_stock' => $stockReported,
+            'report_type' => $type
+        ];
+
+        // 若成功，連動更新貨道庫存
+        if ($status === 'success' && isset($command->payload['slot_no'])) {
+            $machine = $command->machine;
+            $slotNo = $command->payload['slot_no'];
+
+            $slot = $machine->slots()->where('slot_no', $slotNo)->first();
+            if ($slot) {
+                $oldStock = $slot->stock;
+                // 若 APP 回傳的庫存大於 0 則使用回傳值，否則執行扣減
+                $newStock = (int)($stockReported ?? 0);
+                if ($newStock <= 0 && $oldStock > 0) {
+                    $newStock = $oldStock - 1;
+                }
+                
+                $finalStock = max(0, $newStock);
+                $slot->update(['stock' => $finalStock]);
+
+                // 紀錄庫存變化供前端顯示
+                $payloadUpdates['old_stock'] = $oldStock;
+                $payloadUpdates['new_stock'] = $finalStock;
+                
+                // 記錄狀態變化
+                ProcessStateLog::dispatch(
+                    $machine->id,
+                    $machine->company_id,
+                    "Remote dispense successful for slot {$slotNo}",
+                    'info'
+                );
+            }
+        }
+
+        $command->update([
+            'status' => $status,
+            'executed_at' => now(),
+            'payload' => array_merge($command->payload, $payloadUpdates)
+        ]);
+
+        return response()->json([
+            'success' => true,
+            'code' => 200,
+            'message' => 'Result reported'
+        ]);
+    }
 
     /**
      * B018: Record Machine Restock/Setup Report (Asynchronous)