refactor: remove service factory wrappers, call store init methods directly

Replace InitNodeService/GetNodeService/GetNodeServiceForUser with thin
NewLocalNodeService/NewRemoteNodeService constructors; move wiring logic
into cmd/root.go (getNodeService helper) and an inline closure in serve.go.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/cmd/root.go

@@ -11,6 +11,22 @@ import (
 	"github.com/spf13/cobra"
 )
 
+func getNodeService() (service.NodeService, error) {
+	user := cfg.GetUser()
+	if user == "" {
+		return nil, fmt.Errorf("no user configured: run 'ax user set <username>' first")
+	}
+	if rc, ok := cfg.GetRemoteConfig(); ok {
+		base := fmt.Sprintf("http://%s:%d", rc.Host, rc.Port)
+		return service.NewRemoteNodeService(base, user), nil
+	}
+	st, err := store.FindAndOpenSQLiteStore()
+	if err != nil {
+		return nil, err
+	}
+	return service.NewLocalNodeService(st, user), nil
+}
+
 var jsonFlag bool
 var cfg *store.Config
 var rootCmd = &cobra.Command{Use: "ax", Short: "The axolotl issue tracker"}