feat(agent-profile): 限制代理及玩家返点和分成范围，增强权限校验

- 添加ensureSuperAdmin方法，限制管理员设置操作权限
- 在AdminSettingController接口中新增权限检查，防止非超级管理员操作
- AdminPlayerIndexController新增direct agent筛选支持
- AdminPlayerUpdateController新增对信用玩家默认币别变更的拒绝逻辑
- 新增WalletSettlementBillsController，实现玩家信用盘账期账单摘要接口
- AgentProfileService调整，新增返点限额和分享比例自动下调机制，保持子代理及玩家配置不超父级
- AgentProfileService增加can_grant_extra_rebate权限继承限制，阻止无权限代理开启
- AgentSettlementPeriodCloseService增加玩家账单回水信用释放逻辑，确保信用额度同步
- PlayerCreditService新增释放账单回水对应信用逻辑，维护账期信用一致性
- TicketPlacementService和TicketPreviewService新增信用玩家投注币别匹配校验，防止币别不符
- PlayerLedgerLogsService优化信用额度计算，增加可用额度上下限限制，防止负值和超限
- 调整后台管理导航，仅超管可见设置入口，强化权限隔离
- 路由新增玩家信用账单查询接口
- 补充多项AgentProfile相关单元测试覆盖额度限制、返点继承、返点下调场景及权限限制
- 增加站点管理员登录测试，验证系统设置菜单不可见，提升用户权限体验

tests/Feature/SettlementPartialPaymentCreditTest.php

@@ -124,6 +124,26 @@ test('partial payments accumulate settlement_confirm ledger and release used cre
     expect((string) DB::table('settlement_bills')->where('id', $billId)->value('status'))->toBe('settled');
 });
 
+test('rebate in player bill plus net payment releases full loss credit', function (): void {
+    $fixture = partialPaymentCreditFixture(900, 10);
+    $player = $fixture['player'];
+    $billId = $fixture['billId'];
+    $adminId = (int) $fixture['admin']->id;
+
+    app(\App\Services\Player\PlayerCreditService::class)->releaseRebateInBill($player, 100, $billId);
+
+    expect((int) DB::table('player_credit_accounts')->where('player_id', $player->id)->value('used_credit'))
+        ->toBe(9);
+
+    app(SettlementPaymentService::class)->recordPayment($billId, 900, $adminId);
+
+    expect((int) DB::table('player_credit_accounts')->where('player_id', $player->id)->value('used_credit'))
+        ->toBe(0);
+    expect(settlementBillLedgerRows($player, $billId, 'rebate_in_bill'))->toHaveCount(1)
+        ->and((int) settlementBillLedgerRows($player, $billId, 'rebate_in_bill')[0]->amount)->toBe(100)
+        ->and((int) settlementBillLedgerRows($player, $billId, 'settlement_confirm')[0]->amount)->toBe(900);
+});
+
 test('partial payments accumulate settlement_payout ledger for player win bill', function (): void {
     $fixture = partialPaymentCreditFixture(-800);
     $player = $fixture['player'];