fix(frontend): 修复资产页面1秒实时刷新问题

- 使用 mining-service 的 perSecondEarning 替代 assetGrowthPerSecond
- 添加 _timerStarted 标志防止定时器重复启动
- 修复页面进入时定时器可能未启动的问题
- 下拉刷新时同步刷新 shareAccountProvider
- 正确显示每秒增长值

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

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

@@ -7,6 +7,7 @@ import '../../../core/utils/format_utils.dart';
 import '../../../domain/entities/asset_display.dart';
 import '../../providers/user_providers.dart';
 import '../../providers/asset_providers.dart';
+import '../../providers/mining_providers.dart';
 import '../../widgets/shimmer_loading.dart';
 
 class AssetPage extends ConsumerStatefulWidget {
@@ -36,6 +37,7 @@ class _AssetPageState extends ConsumerState<AssetPage> {
   double _initialShareBalance = 0;
   double _growthPerSecond = 0;
   String? _lastAccountSequence;
+  bool _timerStarted = false;
 
   @override
   void dispose() {
@@ -43,13 +45,18 @@ class _AssetPageState extends ConsumerState<AssetPage> {
     super.dispose();
   }
 
-  /// 启动定时器
-  void _startTimer(AssetDisplay asset) {
+  /// 启动定时器（使用外部传入的每秒增长值）
+  void _startTimerWithGrowth(AssetDisplay asset, String perSecondEarning) {
+    // 防止重复启动
+    if (_timerStarted && _refreshTimer != null) return;
+
     _refreshTimer?.cancel();
     _elapsedSeconds = 0;
     _initialDisplayValue = double.tryParse(asset.displayAssetValue) ?? 0;
     _initialShareBalance = double.tryParse(asset.shareBalance) ?? 0;
-    _growthPerSecond = AssetValueCalculator.calculateGrowthPerSecond(asset.assetGrowthPerSecond);
+    // 使用传入的每秒增长值（来自 mining-service）
+    _growthPerSecond = double.tryParse(perSecondEarning) ?? 0;
+    _timerStarted = true;
 
     _refreshTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
       if (mounted) {
@@ -63,7 +70,9 @@ class _AssetPageState extends ConsumerState<AssetPage> {
   /// 重置定时器（刷新时调用）
   void _resetTimer() {
     _refreshTimer?.cancel();
+    _refreshTimer = null;
     _elapsedSeconds = 0;
+    _timerStarted = false;
   }
 
   /// 计算当前实时资产显示值
@@ -84,18 +93,37 @@ class _AssetPageState extends ConsumerState<AssetPage> {
     final accountSequence = user.accountSequence ?? '';
     // 使用 public API，不依赖 JWT token
     final assetAsync = ref.watch(accountAssetProvider(accountSequence));
+    // 从 mining-service 获取每秒收益
+    final shareAccountAsync = ref.watch(shareAccountProvider(accountSequence));
 
     // 提取数据和加载状态
     final isLoading = assetAsync.isLoading || accountSequence.isEmpty;
     final asset = assetAsync.valueOrNull;
+    final shareAccount = shareAccountAsync.valueOrNull;
+
+    // 获取每秒收益（优先使用 mining-service 的数据）
+    final perSecondEarning = shareAccount?.perSecondEarning ?? '0';
+    final hasValidGrowth = (double.tryParse(perSecondEarning) ?? 0) > 0;
 
     // 当数据加载完成时启动定时器
-    if (asset != null && (_lastAsset == null || _lastAccountSequence != accountSequence)) {
-      _lastAccountSequence = accountSequence;
-      _lastAsset = asset;
-      WidgetsBinding.instance.addPostFrameCallback((_) {
-        _startTimer(asset);
-      });
+    if (asset != null && hasValidGrowth) {
+      // 账户切换或首次加载时重置并启动定时器
+      if (_lastAccountSequence != accountSequence) {
+        _lastAccountSequence = accountSequence;
+        _lastAsset = asset;
+        _resetTimer();
+        WidgetsBinding.instance.addPostFrameCallback((_) {
+          if (mounted) _startTimerWithGrowth(asset, perSecondEarning);
+        });
+      } else if (!_timerStarted) {
+        // 定时器未启动时启动（例如页面刚进入）
+        _lastAsset = asset;
+        WidgetsBinding.instance.addPostFrameCallback((_) {
+          if (mounted) _startTimerWithGrowth(asset, perSecondEarning);
+        });
+      } else {
+        _lastAsset = asset;
+      }
     } else if (asset != null) {
       _lastAsset = asset;
     }
@@ -111,6 +139,7 @@ class _AssetPageState extends ConsumerState<AssetPage> {
                 _resetTimer();
                 _lastAsset = null;
                 ref.invalidate(accountAssetProvider(accountSequence));
+                ref.invalidate(shareAccountProvider(accountSequence));
               },
               child: SingleChildScrollView(
                 physics: const AlwaysScrollableScrollPhysics(),
@@ -127,13 +156,13 @@ 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),
+                            _buildTotalAssetCard(asset, isLoading, _currentDisplayValue, perSecondEarning),
                             const SizedBox(height: 24),
                             // 快捷操作按钮
                             _buildQuickActions(context),
                             const SizedBox(height: 24),
                             // 资产列表 - 始终显示，数字部分闪烁，实时刷新
-                            _buildAssetList(asset, isLoading, _currentShareBalance),
+                            _buildAssetList(asset, isLoading, _currentShareBalance, perSecondEarning),
                             const SizedBox(height: 24),
                             // 交易统计
                             _buildEarningsCard(asset, isLoading),
@@ -172,11 +201,9 @@ class _AssetPageState extends ConsumerState<AssetPage> {
     );
   }
 
-  Widget _buildTotalAssetCard(AssetDisplay? asset, bool isLoading, double currentDisplayValue) {
-    // 计算每秒增长
-    final growthPerSecond = asset != null
-        ? AssetValueCalculator.calculateGrowthPerSecond(asset.assetGrowthPerSecond)
-        : 0.0;
+  Widget _buildTotalAssetCard(AssetDisplay? asset, bool isLoading, double currentDisplayValue, 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）
     final displayValue = asset != null && currentDisplayValue > 0
@@ -372,7 +399,7 @@ class _AssetPageState extends ConsumerState<AssetPage> {
     );
   }
 
-  Widget _buildAssetList(AssetDisplay? asset, bool isLoading, double currentShareBalance) {
+  Widget _buildAssetList(AssetDisplay? asset, bool isLoading, double currentShareBalance, String perSecondEarning) {
     // 使用实时积分股余额
     final shareBalance = asset != null && currentShareBalance > 0
         ? currentShareBalance
@@ -395,7 +422,7 @@ class _AssetPageState extends ConsumerState<AssetPage> {
               ? '¥${formatAmount((shareBalance * currentPrice).toString())}'
               : null,
           tag: asset != null ? '含倍数资产: ${formatCompact(multipliedAsset.toString())}' : null,
-          growthText: asset != null ? '每秒 +${formatDecimal(asset.assetGrowthPerSecond, 8)}' : null,
+          growthText: asset != null ? '每秒 +${formatDecimal(perSecondEarning, 8)}' : null,
         ),
         const SizedBox(height: 16),
         // 积分值（现金余额）