feat(admin+api): 代理停用默认、结算加固与冒烟配置探针

- 代理层级默认授信比例与停用冻结/禁登全局默认

- 结算预览去重、比分校验、串关当场判负与市场类型校验

- 站内信 Banner/公告自动通知开关；开发环境动态 API 端口

- 扩充 RBAC/结算/认证/返现单元测试与 agent skills

scripts/ensure-port-free.mjs

@@ -1,6 +1,7 @@
 import { execSync } from 'node:child_process';
+import { resolveDevApiPort } from './resolve-dev-api-target.mjs';
 
-const port = process.argv[2] ?? '3000';
+const port = process.argv[2] ?? resolveDevApiPort();
 
 function killWindows(portNum) {
   let out = '';