feat(admin): 密码校验统一与后台 API/设置增强

- 管理端账号/代理/站点等密码最短长度统一为 6 位
- LotterySettings、审计日志展示、币种与报表接口等小修复
- 补充设置批量更新、注单、校验错误等相关测试

tests/Feature/AdminAuthLoginTest.php

@@ -79,7 +79,7 @@ test('admin login returns bearer token when captcha passes validation', function
         ->assertJsonPath('data.admin.navigation.0.nav_group', 'overview')
         ->assertJsonPath('data.admin.navigation.1.segment', 'agents')
         ->assertJsonPath('data.admin.navigation.1.nav_group', 'agent')
-        ->assertJsonPath('data.admin.navigation.2.segment', 'agent_list')
+        ->assertJsonPath('data.admin.navigation.2.segment', 'settlement_center')
         ->assertJsonStructure(['data' => ['token', 'token_type', 'admin' => ['id', 'username', 'nickname', 'email', 'permissions', 'operational_permissions', 'navigation']]]);
 
     $token = $resp->json('data.token');