perf(backend): allow get for some endpoints

packages/frontend/src/widgets/WidgetOnlineUsers.vue

@@ -40,7 +40,7 @@ const { widgetProps, configure } = useWidgetPropsManager(name,
 const onlineUsersCount = ref(0);
 
 const tick = () => {
-	os.api('get-online-users-count').then(res => {
+	os.apiGet('get-online-users-count').then(res => {
 		onlineUsersCount.value = res.count;
 	});
 };

packages/frontend/src/widgets/WidgetTrends.vue

@@ -53,7 +53,7 @@ const stats = ref([]);
 const fetching = ref(true);
 
 const fetch = () => {
-	os.api('hashtags/trend').then(res => {
+	os.apiGet('hashtags/trend').then(res => {
 		stats.value = res;
 		fetching.value = false;
 	});