fix: update default auth URL from dash.cnap.tech to cnap.tech (#1)

The dashboard and landing page are now served from cnap.tech
(no longer dash.cnap.tech). Update DefaultAuthURL, help text,
and OpenAPI spec to reflect the domain migration.

Author: robinbraemer

internal/api/openapi.json

@@ -39,7 +39,7 @@ and stores a session token. Sessions are long-lived and auto-refresh on use.
 
 With --token, stores the given token directly (PAT or session token).
 
-Create PATs at https://dash.cnap.tech/settings/tokens`,
+Create PATs at https://cnap.tech/settings/tokens`,
 		RunE: func(cmd *cobra.Command, args []string) error {
 			cfg, err := config.Load()
 			if err != nil {

internal/cmd/auth/auth.go

@@ -10,7 +10,7 @@ import (
 
 const (
 	DefaultAPIURL  = "https://api.cnap.tech"
-	DefaultAuthURL = "https://dash.cnap.tech"
+	DefaultAuthURL = "https://cnap.tech"
 	configDir      = ".cnap"
 	configFile     = "config.yaml"
 )