enable retina scale factor (#7269)

* enable retina scale factor

* enabled only when there are only one video service running
* scale mouse event
* scale cursor position
* scale remote menu display button
* adjust resolution

Signed-off-by: 21pages <pages21@163.com>

* Update server.rs

---------

Signed-off-by: 21pages <pages21@163.com>
Co-authored-by: RustDesk <71636191+rustdesk@users.noreply.github.com>

libs/scrap/src/common/quartz.rs

@@ -128,6 +128,10 @@ impl Display {
         self.0.height()
     }
 
+    pub fn scale(&self) -> f64 {
+        self.0.scale()
+    }
+
     pub fn name(&self) -> String {
         self.0.id().to_string()
     }