feat(mining-app): P2P转出记录显示手续费及合计扣除

- P2pTransferModel 新增 fee 字段解析
- 转出卡片聚合显示：转账金额 + 手续费 + 合计扣除
- 转入卡片保持只显示转账金额

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

frontend/mining-app/lib/data/models/p2p_transfer_model.dart

@@ -5,6 +5,7 @@ class P2pTransferModel {
   final String toAccountSequence;
   final String toPhone;
   final String amount;
+  final String fee;
   final String? memo;
   final String status;
   final DateTime createdAt;
@@ -15,6 +16,7 @@ class P2pTransferModel {
     required this.toAccountSequence,
     required this.toPhone,
     required this.amount,
+    required this.fee,
     this.memo,
     required this.status,
     required this.createdAt,
@@ -27,6 +29,7 @@ class P2pTransferModel {
       toAccountSequence: json['toAccountSequence'] ?? '',
       toPhone: json['toPhone'] ?? '',
       amount: json['amount']?.toString() ?? '0',
+      fee: json['fee']?.toString() ?? '0',
       memo: json['memo'],
       status: json['status'] ?? 'PENDING',
       createdAt: json['createdAt'] != null

frontend/mining-app/lib/presentation/pages/asset/p2p_transfer_records_page.dart

@@ -214,24 +214,84 @@ class P2pTransferRecordsPage extends ConsumerWidget {
           const SizedBox(height: 12),
           const Divider(height: 1),
           const SizedBox(height: 12),
-          // 金额
+          // 转出：显示流水明细（转账金额 + 手续费 + 合计扣除）
-          Row(
+          // 转入：只显示转账金额
-            mainAxisAlignment: MainAxisAlignment.spaceBetween,
+          if (isSend) ...[
-            children: [
+            // 转账金额
-              const Text(
+            Row(
-                '转账金额',
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                style: TextStyle(fontSize: 13, color: _grayText),
+              children: [
-              ),
+                const Text(
-              Text(
+                  '转账金额',
-                '${isSend ? '-' : '+'}${formatAmount(record.amount)} 积分值',
+                  style: TextStyle(fontSize: 13, color: _grayText),
-                style: TextStyle(
-                  fontSize: 15,
-                  fontWeight: FontWeight.bold,
-                  color: isSend ? _orange : _green,
                 ),
+                Text(
+                  '-${formatAmount(record.amount)} 积分值',
+                  style: const TextStyle(fontSize: 13, color: _darkText),
+                ),
+              ],
+            ),
+            // 手续费
+            if (double.tryParse(record.fee) != null && double.parse(record.fee) > 0) ...[
+              const SizedBox(height: 6),
+              Row(
+                mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                children: [
+                  const Text(
+                    '手续费',
+                    style: TextStyle(fontSize: 13, color: _grayText),
+                  ),
+                  Text(
+                    '-${formatAmount(record.fee)} 积分值',
+                    style: const TextStyle(fontSize: 13, color: _darkText),
+                  ),
+                ],
               ),
+              const SizedBox(height: 8),
+              const Divider(height: 1),
+              const SizedBox(height: 8),
+              // 合计扣除
+              Row(
+                mainAxisAlignment: MainAxisAlignment.spaceBetween,
+                children: [
+                  const Text(
+                    '合计扣除',
+                    style: TextStyle(fontSize: 14, fontWeight: FontWeight.w600, color: _darkText),
+                  ),
+                  Text(
+                    '-${formatAmount(_addAmounts(record.amount, record.fee))} 积分值',
+                    style: TextStyle(
+                      fontSize: 15,
+                      fontWeight: FontWeight.bold,
+                      color: _orange,
+                    ),
+                  ),
+                ],
+              ),
+            ] else ...[
+              // 无手续费时，转账金额用醒目样式
+              // (已在上面显示，无需重复)
             ],
-          ),
+          ] else ...[
+            // 转入：只显示金额
+            Row(
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+              children: [
+                const Text(
+                  '转账金额',
+                  style: TextStyle(fontSize: 13, color: _grayText),
+                ),
+                Text(
+                  '+${formatAmount(record.amount)} 积分值',
+                  style: TextStyle(
+                    fontSize: 15,
+                    fontWeight: FontWeight.bold,
+                    color: _green,
+                  ),
+                ),
+              ],
+            ),
+          ],
           const SizedBox(height: 8),
           // 对方账号
           Row(
@@ -298,6 +358,12 @@ class P2pTransferRecordsPage extends ConsumerWidget {
     );
   }
 
+  String _addAmounts(String a, String b) {
+    final va = double.tryParse(a) ?? 0;
+    final vb = double.tryParse(b) ?? 0;
+    return (va + vb).toStringAsFixed(8);
+  }
+
   String _maskPhone(String phone) {
     if (phone.length != 11) return phone;
     return '${phone.substring(0, 3)}****${phone.substring(7)}';