fix: 回退ensureDevicesLoaded，恢复原版'全离线才搜索'逻辑

internal/web/ui.go

@@ -942,15 +942,15 @@ func (u *UI) ensureDevicesLoaded() {
     }
     devices := u.registry.GetDevices()
     if len(devices) > 0 {
-        // Check if any device is offline; trigger discovery to refresh
-        hasOffline := false
+        // Check if any device is online; if not, try discovery to refresh
+        hasOnline := false
         for _, d := range devices {
-            if !d.Online {
-                hasOffline = true
+            if d.Online {
+                hasOnline = true
                 break
             }
         }
-        if !hasOffline {
+        if hasOnline {
             return
         }
     }