fix: 修复自定义认证密码功能异常 (#771)

fix: 修复自定义认证密码功能异常的问题

- 修复前端属性名错误 (openSettings.auth -> openSettings.needAuth)
- 修复 /open_api/settings 接口被自定义认证拦截的问题

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

Co-authored-by: Claude <noreply@anthropic.com>

frontend/src/api/index.js

@@ -41,7 +41,7 @@ const apiFetch = async (path, options = {}) => {
         if (response.status === 401 && path.startsWith("/admin")) {
             showAdminAuth.value = true;
         }
-        if (response.status === 401 && openSettings.value.auth) {
+        if (response.status === 401 && openSettings.value.needAuth) {
             showAuth.value = true;
         }
         if (response.status >= 300) {