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>

go.mod

@@ -5,16 +5,20 @@ go 1.26.3
 require (
 	github.com/atotto/clipboard v0.1.4 // indirect
 	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
+	github.com/catppuccin/go v0.3.0 // indirect
 	github.com/charmbracelet/bubbles v1.0.0 // indirect
 	github.com/charmbracelet/bubbletea v1.3.10 // indirect
 	github.com/charmbracelet/colorprofile v0.4.1 // indirect
+	github.com/charmbracelet/huh v1.0.0 // indirect
 	github.com/charmbracelet/lipgloss v1.1.0 // indirect
 	github.com/charmbracelet/x/ansi v0.11.6 // indirect
 	github.com/charmbracelet/x/cellbuf v0.0.15 // indirect
+	github.com/charmbracelet/x/exp/strings v0.0.0-20240722160745-212f7b056ed0 // indirect
 	github.com/charmbracelet/x/term v0.2.2 // indirect
 	github.com/clipperhouse/displaywidth v0.9.0 // indirect
 	github.com/clipperhouse/stringish v0.1.1 // indirect
 	github.com/clipperhouse/uax29/v2 v2.5.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
@@ -23,6 +27,7 @@ require (
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-localereader v0.0.1 // indirect
 	github.com/mattn/go-runewidth v0.0.19 // indirect
+	github.com/mitchellh/hashstructure/v2 v2.0.2 // indirect
 	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
 	github.com/muesli/cancelreader v0.2.2 // indirect
 	github.com/muesli/termenv v0.16.0 // indirect