fix(mobile): 预种可结算列表以wallet实际金额为准，避免已结算条目残留

planting-service 的分配记录不跟踪 wallet 端的结算状态，
原来的反向排除法（排除PENDING+EXPIRED）无法处理：
1. 已结算到余额（SETTLED→余额）的条目
2. hasPlanted=true 后直接进可结算、不经 pending_rewards 的条目

改为以 walletInfo.rewards.settleableUsdt 为权威来源：
- settleableUsdt=0 时直接跳过（已全部结算到余额）
- settleableUsdt>0 时按金额截断，确保展示总额不超过实际可结算

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

frontend/mobile-app/lib/features/profile/presentation/pages/profile_page.dart

@@ -801,39 +801,52 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
 
       // [2026-03-01] 合并预种可结算奖励到列表中
       // pre-planting/my-rewards 返回所有分配记录（不区分状态），
-      // 但部分条目可能实际处于 PENDING 状态（用户未认种时）。
+      // 需要排除 PENDING、EXPIRED 和已结算到余额的条目，只保留真正可结算的。
-      // 需要排除 PENDING 和 EXPIRED 状态的条目，只保留真正可结算的。
+      //
-      final pendingPplOrderIds = walletPendingRewards
+      // 策略：以 wallet 的 settleableUsdt 为权威来源。
-          .where((r) => r.isPrePlanting)
+      // 如果 settleableUsdt=0（已全部结算到余额），直接跳过，不显示任何预种可结算条目。
-          .map((r) => r.sourceOrderId)
+      // 如果 settleableUsdt>0，排除 PENDING + EXPIRED 的条目后，
-          .toSet();
+      // 按金额截断，确保展示总额不超过 wallet 实际可结算金额。
-      final expiredPplOrderIds = expiredRewards
+      final walletSettleableUsdt = walletInfo.rewards.settleableUsdt;
-          .where((r) => r.sourceOrderId.startsWith('PPL'))
+      List<SettleableRewardItem> prePlantingSettleable = [];
-          .map((r) => r.sourceOrderId)
+
-          .toSet();
+      if (walletSettleableUsdt > 0) {
-      final excludedPplOrderIds = {...pendingPplOrderIds, ...expiredPplOrderIds};
+        final pendingPplOrderIds = walletPendingRewards
-      final prePlantingSettleable = prePlantingRewards.settleableRewards
+            .where((r) => r.isPrePlanting)
-          .where((r) => !excludedPplOrderIds.contains(r.sourceOrderNo))
+            .map((r) => r.sourceOrderId)
-          .map((r) {
+            .toSet();
-            final srcAcct = r.sourceAccountSequence;
+        final expiredPplOrderIds = expiredRewards
-            final memoSuffix = (srcAcct != null && srcAcct.isNotEmpty)
+            .where((r) => r.sourceOrderId.startsWith('PPL'))
-                ? '：来自${srcAcct}的预种'
+            .map((r) => r.sourceOrderId)
-                : '';
+            .toSet();
-            return SettleableRewardItem(
+        final excludedPplOrderIds = {...pendingPplOrderIds, ...expiredPplOrderIds};
-                id: r.id,
+
-                rightType: r.rightType,
+        double accumulatedUsdt = 0;
-                usdtAmount: r.usdtAmount,
+        for (final r in prePlantingRewards.settleableRewards) {
-                hashpowerAmount: r.hashpowerAmount,
+          if (excludedPplOrderIds.contains(r.sourceOrderNo)) continue;
-                createdAt: r.createdAt,
+          if (accumulatedUsdt + r.usdtAmount > walletSettleableUsdt + 0.01) break;
-                claimedAt: null,
+          accumulatedUsdt += r.usdtAmount;
-                sourceOrderNo: r.sourceOrderNo,
+
-                sourceAccountSequence: r.sourceAccountSequence,
+          final srcAcct = r.sourceAccountSequence;
-                memo: '[预种] ${r.memo}$memoSuffix',
+          final memoSuffix = (srcAcct != null && srcAcct.isNotEmpty)
-            );
+              ? '：来自${srcAcct}的预种'
-          })
+              : '';
-          .toList();
+          prePlantingSettleable.add(SettleableRewardItem(
+              id: r.id,
+              rightType: r.rightType,
+              usdtAmount: r.usdtAmount,
+              hashpowerAmount: r.hashpowerAmount,
+              createdAt: r.createdAt,
+              claimedAt: null,
+              sourceOrderNo: r.sourceOrderNo,
+              sourceAccountSequence: r.sourceAccountSequence,
+              memo: '[预种] ${r.memo}$memoSuffix',
+          ));
+        }
+      }
+
       settleableRewards = [...settleableRewards, ...prePlantingSettleable];
-      debugPrint('[ProfilePage] 预种可结算奖励: ${prePlantingSettleable.length} 条 (排除 ${pendingPplOrderIds.length} 条 PENDING, ${expiredPplOrderIds.length} 条 EXPIRED)');
+      debugPrint('[ProfilePage] 预种可结算奖励: ${prePlantingSettleable.length} 条 (walletSettleableUsdt=$walletSettleableUsdt)');
 
       // [2026-03-01] 合并预种待领取奖励到列表中
       // wallet-service 的 pending_rewards 表包含正常认种 + 预种的待领取记录，