refactor(frontend): 资产页面显示实际积分股和价格，移除倍数

- 资产显示值改为 积分股余额 × price（不含倍数）
- 显示实际积分股数量而非含倍数的有效积分股
- 简化实时计算逻辑

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/mining-app/lib/presentation/pages/asset/asset_page.dart

@@ -33,7 +33,6 @@ class _AssetPageState extends ConsumerState<AssetPage> {
   // 实时刷新相关状态
   Timer? _refreshTimer;
   int _elapsedSeconds = 0;
-  double _initialDisplayValue = 0;
   double _initialShareBalance = 0;
   double _growthPerSecond = 0;
   String? _lastAccountSequence;
@@ -54,7 +53,6 @@ class _AssetPageState extends ConsumerState<AssetPage> {
 
     _refreshTimer?.cancel();
     _elapsedSeconds = 0;
-    _initialDisplayValue = double.tryParse(asset.displayAssetValue) ?? 0;
     _initialShareBalance = double.tryParse(asset.shareBalance) ?? 0;
     // 使用传入的每秒增长值（来自 mining-service）
     _growthPerSecond = double.tryParse(perSecondEarning) ?? 0;
@@ -78,13 +76,10 @@ class _AssetPageState extends ConsumerState<AssetPage> {
   }
 
   /// 计算当前实时资产显示值
-  /// 资产显示值 = 积分股余额 × (1 + burnMultiplier) × price
-  /// 每秒资产增长 = 每秒积分股增长 × (1 + burnMultiplier) × price
+  /// 资产显示值 = 积分股余额 × price（不含倍数，使用实际价格）
   double get _currentDisplayValue {
     final price = double.tryParse(_lastAsset?.currentPrice ?? '0') ?? 0;
-    final burnMultiplier = double.tryParse(_lastAsset?.burnMultiplier ?? '0') ?? 0;
-    final multiplierFactor = 1 + burnMultiplier;
-    return _initialDisplayValue + (_elapsedSeconds * _growthPerSecond * multiplierFactor * price);
+    return _currentShareBalance * price;
   }
 
   /// 计算当前实时积分股余额
@@ -163,7 +158,7 @@ class _AssetPageState extends ConsumerState<AssetPage> {
                           children: [
                             const SizedBox(height: 8),
                             // 总资产卡片 - 始终显示，数字部分闪烁，实时刷新
-                            _buildTotalAssetCard(asset, isLoading, _currentDisplayValue, perSecondEarning),
+                            _buildTotalAssetCard(asset, isLoading, _currentDisplayValue, _currentShareBalance, perSecondEarning),
                             const SizedBox(height: 24),
                             // 快捷操作按钮
                             _buildQuickActions(context),
@@ -208,14 +203,19 @@ class _AssetPageState extends ConsumerState<AssetPage> {
     );
   }
 
-  Widget _buildTotalAssetCard(AssetDisplay? asset, bool isLoading, double currentDisplayValue, String perSecondEarning) {
+  Widget _buildTotalAssetCard(AssetDisplay? asset, bool isLoading, double currentDisplayValue, double currentShareBalance, String perSecondEarning) {
     // 使用传入的每秒增长值（来自 mining-service）
     final growthPerSecond = double.tryParse(perSecondEarning) ?? 0.0;
 
-    // 使用实时计算的资产值（如果有）
+    // 使用实时计算的资产值（如果有）- 不含倍数
     final displayValue = asset != null && currentDisplayValue > 0
         ? currentDisplayValue.toString()
-        : asset?.displayAssetValue;
+        : null;
+
+    // 使用实时计算的积分股余额（如果有）- 实际数量，不含倍数
+    final shareBalance = asset != null && currentShareBalance > 0
+        ? currentShareBalance.toString()
+        : asset?.shareBalance;
 
     return Container(
       decoration: BoxDecoration(
@@ -300,9 +300,9 @@ class _AssetPageState extends ConsumerState<AssetPage> {
                   ),
                 ),
                 const SizedBox(height: 4),
-                // 有效积分股
+                // 积分股余额 - 实际数量
                 DataText(
-                  data: asset != null ? '≈ ${formatCompact(asset.effectiveShares)} 积分股 (含倍数)' : null,
+                  data: shareBalance != null ? '≈ ${formatCompact(shareBalance)} 积分股' : null,
                   isLoading: isLoading,
                   placeholder: '≈ -- 积分股',
                   style: const TextStyle(