feat(mobile-app): 优化流水明细筛选选项

- 将"奖励转可结算"改为"分享收益"，更准确描述分享权益
- 新增"权益收入"筛选项(SYSTEM_ALLOCATION)，用于筛选：
  - 社区权益
  - 市/省团队权益
  - 市/省区域权益

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/mobile-app/lib/features/trading/presentation/pages/ledger_detail_page.dart

@@ -41,7 +41,8 @@ class _LedgerDetailPageState extends ConsumerState<LedgerDetailPage>
     {'value': 'TRANSFER_IN', 'label': '转入'},
     {'value': 'TRANSFER_OUT', 'label': '转出'},
     {'value': 'PLANT_PAYMENT', 'label': '认种支付'},
-    {'value': 'REWARD_TO_SETTLEABLE', 'label': '奖励转可结算'},
+    {'value': 'REWARD_TO_SETTLEABLE', 'label': '分享收益'},
+    {'value': 'SYSTEM_ALLOCATION', 'label': '权益收入'},
     {'value': 'REWARD_EXPIRED', 'label': '奖励过期'},
     {'value': 'WITHDRAWAL', 'label': '提现'},
     {'value': 'REWARD_SETTLED', 'label': '结算'},