7天登录趋势接口传入地区；

src/views/PlatformData/UserLoginStats.vue

@@ -404,6 +404,10 @@ const fetchTrendData = async () => {
         chartTrendTitle.value = '近7天登录趋势';
     }
     
+    if (selectedRegion.value && selectedRegion.value !== 'all') {
+        params.region = selectedRegion.value;
+    }
+
     try {
         const res = await getUserLoginTrend(params);
         console.log("获取用户登录趋势响应:", res);