feat: interactive setup wizard for first-run and netssh configure

- Auto-detects missing config (netbox.url empty) and launches wizard
- `netssh configure` re-runs the wizard anytime to change settings
- 3-page huh form: NetBox connection, SSH defaults, resolver & cache
- Saves to ~/.config/netssh.yaml (permissions 0600)

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

cmd/netssh/main.go

@@ -16,12 +16,14 @@ import (
 	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/config"
 	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/netbox"
 	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/resolver"
+	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/setup"
 	internalssh "git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/ssh"
 	"git.zb-server.de/Sebi/ssh-netbox-wrapper/internal/tui"
 )
 
 // managedSubcommands are dispatched to cobra; everything else is treated as SSH wrapper mode.
 var managedSubcommands = map[string]bool{
+	"configure":  true,
 	"search":     true,
 	"cache":      true,
 	"completion": true,
@@ -47,12 +49,28 @@ func main() {
 	runSSHWrapper(args)
 }
 
-// runSSHWrapper resolves the target hostname via NetBox and execs the native ssh binary.
-func runSSHWrapper(args []string) {
+// loadConfigOrSetup loads the config and runs the setup wizard if NetBox is not configured.
+func loadConfigOrSetup() *config.Config {
 	cfg, err := config.Load()
 	if err != nil {
 		fatalf("config: %v", err)
 	}
+	if cfg.NetBox.URL == "" {
+		fmt.Fprintln(os.Stderr, "No configuration found. Starting setup…")
+		if err := setup.RunWizard(cfg); err != nil {
+			fatalf("setup: %v", err)
+		}
+		cfg, err = config.Load()
+		if err != nil {
+			fatalf("config: %v", err)
+		}
+	}
+	return cfg
+}
+
+// runSSHWrapper resolves the target hostname via NetBox and execs the native ssh binary.
+func runSSHWrapper(args []string) {
+	cfg := loadConfigOrSetup()
 
 	parsed := internalssh.Parse(args)
 	if parsed == nil {
@@ -127,10 +145,7 @@ func connect(ip string, parsed *internalssh.ParsedArgs, originalArgs []string) {
 
 // runTUI starts the interactive host search.
 func runTUI() {
-	cfg, err := config.Load()
-	if err != nil {
-		fatalf("config: %v", err)
-	}
+	cfg := loadConfigOrSetup()
 
 	c := cache.New(cfg.Cache.Path, cfg.Cache.TTL)
 	_ = c.Load()
@@ -193,10 +208,24 @@ func rootCmd() *cobra.Command {
 	}
 
 	// cobra automatically adds a "completion" subcommand
-	root.AddCommand(searchCmd(), cacheCmd())
+	root.AddCommand(configureCmd(), searchCmd(), cacheCmd())
 	return root
 }
 
+func configureCmd() *cobra.Command {
+	return &cobra.Command{
+		Use:   "configure",
+		Short: "Interactively configure netssh",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			cfg, _ := config.Load()
+			if cfg == nil {
+				cfg = &config.Config{}
+			}
+			return setup.RunWizard(cfg)
+		},
+	}
+}
+
 func searchCmd() *cobra.Command {
 	return &cobra.Command{
 		Use:   "search <query>",