fix(mining-app): 添加收款方验证成功提示和调试日志

- 验证成功时显示绿色 SnackBar 提示
- 添加调试日志帮助诊断可用余额问题
- 温馨提示中添加积分值获取方式说明

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

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

@@ -48,6 +48,27 @@ class _SendSharesPageState extends ConsumerState<SendSharesPage> {
 
     final availableCash = assetAsync.valueOrNull?.availableCash ?? '0';
 
+    // Debug: 打印资产数据
+    debugPrint('=== SendSharesPage 资产数据 ===');
+    debugPrint('user.isLoggedIn: ${user.isLoggedIn}');
+    debugPrint('user.phone: ${user.phone}');
+    debugPrint('accountSequence: $accountSequence');
+    debugPrint('assetAsync.hasValue: ${assetAsync.hasValue}');
+    debugPrint('assetAsync.hasError: ${assetAsync.hasError}');
+    if (assetAsync.hasError) {
+      debugPrint('assetAsync.error: ${assetAsync.error}');
+    }
+    if (assetAsync.hasValue && assetAsync.value != null) {
+      final asset = assetAsync.value!;
+      debugPrint('availableCash: ${asset.availableCash}');
+      debugPrint('cashBalance: ${asset.cashBalance}');
+      debugPrint('frozenCash: ${asset.frozenCash}');
+      debugPrint('availableShares: ${asset.availableShares}');
+      debugPrint('shareBalance: ${asset.shareBalance}');
+    }
+    debugPrint('最终 availableCash: $availableCash');
+    debugPrint('==============================');
+
     return Scaffold(
       backgroundColor: _bgGray,
       appBar: AppBar(
@@ -461,7 +482,7 @@ class _SendSharesPageState extends ConsumerState<SendSharesPage> {
           ),
           SizedBox(height: 8),
           Text(
-            '1. 转账前请确认收款方账号正确\n2. 积分值转账不可撤销，请谨慎操作\n3. 转账后将从您的可用积分值中扣除',
+            '1. 转账前请确认收款方账号正确\n2. 积分值转账不可撤销，请谨慎操作\n3. 转账后将从您的可用积分值中扣除\n4. 积分值是通过卖出积分股获得的，如需转账请先卖出积分股',
             style: TextStyle(
               fontSize: 12,
               color: _grayText,
@@ -533,6 +554,15 @@ class _SendSharesPageState extends ConsumerState<SendSharesPage> {
         _isRecipientVerified = true;
         _recipientNickname = account.nickname ?? _maskPhone(phone);
       });
+      // 显示验证成功提示
+      if (mounted) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            content: Text('收款方验证成功: ${account.nickname ?? _maskPhone(phone)}'),
+            backgroundColor: _green,
+          ),
+        );
+      }
     } else {
       setState(() {
         _isRecipientVerified = false;