fix: 设备选择操作不触发UDP发现，消除勾选延迟

internal/web/ui.go

@@ -5055,7 +5055,10 @@ func selectedURL(path string, ids []string) string {
 }
 
 func (u *UI) deviceOverviewPageData(r *http.Request, selectedIDs []string, errMsg string) PageData {
-    u.ensureDevicesLoaded()
+    // Skip discovery when just toggling selection (device_id in query).
+    if len(r.URL.Query()["device_id"]) == 0 && len(r.URL.Query()["selected"]) == 0 {
+        u.ensureDevicesLoaded()
+    }
     devices := u.registry.GetDevices()
     rows := make([]DeviceOverviewRow, 0, len(devices))
     for _, dev := range devices {