fix(pre-planting): 合并详情页 USDT 改为绿积分

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/mobile-app/lib/features/pre_planting/presentation/pages/pre_planting_merge_detail_page.dart

@@ -119,7 +119,7 @@ class _PrePlantingMergeDetailPageState
               ),
             ),
             SizedBox(height: 8),
-            _BulletPoint('解锁 eUSDT 交易权限'),
+            _BulletPoint('解锁绿积分交易权限'),
             _BulletPoint('解锁提现权限'),
             _BulletPoint('解锁授权申请权限'),
             _BulletPoint('开启挖矿收益分配'),
@@ -421,7 +421,7 @@ class _PrePlantingMergeDetailPageState
           const SizedBox(height: 8),
           _buildDetailRow(
             '总价值',
-            '${(merge.sourceOrderNos.length * 3566).toString()} USDT',
+            '${(merge.sourceOrderNos.length * 3566).toString()} 绿积分',
           ),
           if (merge.selectedProvince != null) ...[
             const SizedBox(height: 8),
@@ -605,7 +605,7 @@ class _PrePlantingMergeDetailPageState
                     ),
                   ),
                   const Text(
-                    '3,171 USDT',
+                    '3,171 绿积分',
                     style: TextStyle(
                       fontSize: 13,
                       color: Color(0xFF745D43),