[FEAT] 廣告排程功能與 UI 優化

1. 新增廣告排程功能，支援設定發布時間與下架時間。
2. 整合 Flatpickr 時間選擇器，提供與機台日誌一致的極簡奢華風 UI。
3. 優化廣告列表中的數字字體，套用 font-mono 與 tabular-nums，與客戶管理模組風格同步。
4. 修正 Alpine.js 資料同步邏輯，確保編輯模式下排程時間能正確回填。

app/Http/Controllers/Admin/AdvertisementController.php

@@ -21,7 +21,9 @@ class AdvertisementController extends AdminController
 
         // Tab 1: 廣告列表
         $advertisements = Advertisement::with('company')->latest()->paginate(10);
-        $allAds = Advertisement::active()->get();
+        
+        // Tab 2: 機台廣告設置 (所需資料) - 隱藏已過期的廣告
+        $allAds = Advertisement::playing()->get();
 
         // Tab 2: 機台廣告設置 (所需資料)
         // 取得使用者有權限的機台列表 (已透過 Global Scope 過濾)
@@ -54,6 +56,8 @@ class AdvertisementController extends AdminController
                 $request->type === 'image' ? 'max:10240' : 'max:51200', // Image 10MB, Video 50MB
             ],
             'company_id' => 'nullable|exists:companies,id',
+            'start_at' => 'nullable|date',
+            'end_at' => 'nullable|date|after_or_equal:start_at',
         ]);
 
         $user = auth()->user();
@@ -71,13 +75,15 @@ class AdvertisementController extends AdminController
             $companyId = $user->company_id;
         }
 
-        Advertisement::create([
+        $advertisement = Advertisement::create([
             'company_id' => $companyId,
             'name' => $request->name,
             'type' => $request->type,
             'duration' => (int) $request->duration,
             'url' => Storage::disk('public')->url($path),
             'is_active' => true,
+            'start_at' => $request->start_at,
+            'end_at' => $request->end_at,
         ]);
 
         if ($request->wantsJson()) {
@@ -99,6 +105,8 @@ class AdvertisementController extends AdminController
             'duration' => 'required|in:15,30,60',
             'is_active' => 'boolean',
             'company_id' => 'nullable|exists:companies,id',
+            'start_at' => 'nullable|date',
+            'end_at' => 'nullable|date|after_or_equal:start_at',
         ];
 
         if ($request->hasFile('file')) {
@@ -111,7 +119,7 @@ class AdvertisementController extends AdminController
 
         $request->validate($rules);
 
-        $data = $request->only(['name', 'type', 'duration']);
+        $data = $request->only(['name', 'type', 'duration', 'start_at', 'end_at']);
         $data['is_active'] = $request->has('is_active');
         
         $user = auth()->user();
@@ -150,7 +158,7 @@ class AdvertisementController extends AdminController
         return redirect()->back()->with('success', __('Advertisement updated successfully.'));
     }
 
-    public function destroy(Advertisement $advertisement)
+    public function destroy(Request $request, Advertisement $advertisement)
     {
         // 檢查是否有機台正投放中
         if ($advertisement->machineAdvertisements()->exists()) {