fix: return JSON on logout success instead of 302 redirect to avoid cross-origin redirect

src/main/java/com/freedom/admin/config/WebSecurityConfig.java

@@ -1,5 +1,7 @@
 package com.freedom.admin.config;
 
+import com.alibaba.fastjson.JSON;
+import com.freedom.admin.common.Result;
 import com.freedom.admin.service.impl.UserServiceImpl;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.Bean;
@@ -84,6 +86,14 @@ public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
                     .and()
                 .logout()
                     .logoutUrl("/logout")
+                    .logoutSuccessHandler((request, response, authentication) -> {
+                        // 返回 JSON 而非默认 302 跳转 /login?logout，
+                        // 避免前端 axios 跟随重定向触发跨域拦截
+                        Result result = Result.ok().message("退出成功");
+                        response.setCharacterEncoding("utf-8");
+                        response.setContentType("application/json");
+                        response.getWriter().write(JSON.toJSONString(result));
+                    })
                     .and()
                 .rememberMe()
                     .rememberMeParameter("rememberme")