feat: 增强代理结算和账单管理功能

- 在多个控制器中引入 SettlementPartyEnrichment 服务，以优化代理结算和账单的处理逻辑。
- 更新 AgentSettlementBillIndexController 和 AgentSettlementBillShowController，支持根据账单 ID 和关键字进行查询。
- 在 AgentSettlementPeriodCloseController 中添加对站点管理权限的验证，确保只有具备相应权限的管理员能够关闭账期。
- 在 AgentSettlementPeriodIndexController 中更新账期数据的返回格式，提升数据的完整性和可用性。
- 引入对相对占成比例的支持，增强代理资料的管理能力，确保数据一致性。

lang/en/validation_business.php

@@ -22,4 +22,12 @@ return [
     'cannot_create_child_agent' => 'You are not allowed to create sub-agents.',
     'cannot_create_player' => 'You are not allowed to create players.',
     'primary_account_missing' => 'This agent has no bound login account; username cannot be updated.',
+    'agent_overdue' => 'This agent has overdue bills. This operation is not allowed.',
+    'agent_line_severe_overdue' => 'This agent line has severe overdue (over 7 days). Betting is frozen.',
+    'parent_overdue' => 'The parent agent has overdue bills. This operation is not allowed.',
+    'period_already_open' => 'A period with this date range is already open. Close it instead of opening again.',
+    'period_site_has_open' => 'This site already has an open period. Close it before opening a new one.',
+    'period_not_found' => 'Settlement period not found or not accessible.',
+    'period_already_closed' => 'This period is already closed.',
+    'share_snapshot_missing' => 'Some ledger rows are missing share snapshots. Complete draw settlement first.',
 ];