fix(inbounds): drop unknown nodeId when importing an inbound

Importing an inbound that was exported from another panel (or whose node
was later deleted) carried a non-zero nodeId referencing a node that does
not exist on the importing panel. AddInbound -> nodePushPlan -> NodeSyncState
looked that node up and returned gorm's "record not found", so the import
failed with "Something went wrong Failed: record not found".

Node IDs are panel-local and not portable, so the import handler now drops a
nodeId that does not exist on this panel (new NodeService.NodeExists helper),
importing it as a local inbound instead of erroring. This mirrors the existing
nodeId==0 normalization in the same handler.

web/controller/inbound.go

@@ -350,8 +350,16 @@ func (a *InboundController) importInbound(c *gin.Context) {
 	user := session.GetLoginUser(c)
 	inbound.Id = 0
 	inbound.UserId = user.Id
-	if inbound.NodeID != nil && *inbound.NodeID == 0 {
-		inbound.NodeID = nil
+	// Node IDs are panel-local and not portable across panels. Drop a node
+	// reference that is zero or that points to a node which doesn't exist on
+	// this panel, so a cross-panel export imports as a local inbound instead of
+	// failing with "record not found" when nodePushPlan looks the node up.
+	if inbound.NodeID != nil {
+		if *inbound.NodeID == 0 {
+			inbound.NodeID = nil
+		} else if exists, err := (&service.NodeService{}).NodeExists(*inbound.NodeID); err == nil && !exists {
+			inbound.NodeID = nil
+		}
 	}
 
 	for index := range inbound.ClientStats {

web/service/node.go

@@ -298,6 +298,20 @@ func (s *NodeService) GetById(id int) (*model.Node, error) {
 	return n, nil
 }
 
+// NodeExists reports whether a node with the given id exists on this panel.
+// Used to drop stale, cross-panel node references on inbound import. A Count
+// query distinguishes "no such node" (count 0, no error) from a real DB error.
+func (s *NodeService) NodeExists(id int) (bool, error) {
+	if id <= 0 {
+		return false, nil
+	}
+	var count int64
+	if err := database.GetDB().Model(model.Node{}).Where("id = ?", id).Count(&count).Error; err != nil {
+		return false, err
+	}
+	return count > 0, nil
+}
+
 func normalizeBasePath(p string) string {
 	p = strings.TrimSpace(p)
 	if p == "" {