[client/ui] Replace fyne UI with Wails (rename ui-wails to ui)

Removes the legacy fyne-based client/ui implementation and renames the
Wails replacement (client/ui-wails) to take its place at client/ui. Go
imports, frontend bindings, CI workflows, goreleaser configs and the
windows .syso icon path are updated to follow the rename.

client/ui/services/conn.go

@@ -0,0 +1,13 @@
+//go:build !android && !ios && !freebsd && !js
+
+package services
+
+import "github.com/netbirdio/netbird/client/proto"
+
+// DaemonConn returns a lazy gRPC client to the NetBird daemon.
+// All services receive a DaemonConn so they share a single connection.
+type DaemonConn interface {
+	Client() (proto.DaemonServiceClient, error)
+}
+
+func ptrStr(s string) *string { return &s }