[management,client] Make DNS ForwarderPort Configurable & Change Well Known Port (#4479)

makes the DNS forwarder port configurable in the management and client components, while changing the well-known port from 5454 to 22054. The change includes version-aware port assignment to ensure backward compatibility.

- Adds a configurable `ForwarderPort` field to the DNS configuration protocol
- Implements version-based port computation that returns the new port (22054) only when all peers support version 0.59.0 or newer
- Updates the client to dynamically restart the DNS forwarder when the port changes

management/server/peer/peer.go

@@ -233,21 +233,24 @@ func (p *Peer) Copy() *Peer {
 
 // UpdateMetaIfNew updates peer's system metadata if new information is provided
 // returns true if meta was updated, false otherwise
-func (p *Peer) UpdateMetaIfNew(meta PeerSystemMeta) bool {
+func (p *Peer) UpdateMetaIfNew(meta PeerSystemMeta) (updated, versionChanged bool) {
 	if meta.isEmpty() {
-		return false
+		return updated, versionChanged
 	}
 
+	versionChanged = p.Meta.WtVersion != meta.WtVersion
+
 	// Avoid overwriting UIVersion if the update was triggered sole by the CLI client
 	if meta.UIVersion == "" {
 		meta.UIVersion = p.Meta.UIVersion
 	}
 
 	if p.Meta.isEqual(meta) {
-		return false
+		return updated, versionChanged
 	}
 	p.Meta = meta
-	return true
+	updated = true
+	return updated, versionChanged
 }
 
 // GetLastLogin returns the last login time of the peer.