Add WireGuard TUI implementation

- Add Go TUI with bubbletea for WireGuard management
- Implement client CRUD operations with QR code generation
- Add configuration and validation modules
- Install/update scripts for client setup
- Update Makefile to build binaries to bin/ directory
- Add .gitignore for Go projects

internal/tui/components/confirm.go

@@ -0,0 +1,143 @@
+package components
+
+import (
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+)
+
+// ConfirmModel represents a confirmation modal
+type ConfirmModel struct {
+	Message string
+	Yes     bool // true = yes, false = no
+	Visible bool
+	Width   int
+	Height  int
+}
+
+// Styles
+var (
+	confirmModalStyle = lipgloss.NewStyle().
+				Border(lipgloss.RoundedBorder()).
+				BorderForeground(lipgloss.Color("196")).
+				Padding(1, 2).
+				Background(lipgloss.Color("235"))
+	confirmTitleStyle = lipgloss.NewStyle().
+				Foreground(lipgloss.Color("226")).
+				Bold(true)
+	confirmMessageStyle = lipgloss.NewStyle().
+				Foreground(lipgloss.Color("255")).
+				Width(50)
+	confirmHelpStyle = lipgloss.NewStyle().
+				Foreground(lipgloss.Color("241")).
+				MarginTop(1)
+)
+
+// NewConfirm creates a new confirmation modal
+func NewConfirm(message string, width, height int) *ConfirmModel {
+	return &ConfirmModel{
+		Message: message,
+		Yes:     false,
+		Visible: true,
+		Width:   width,
+		Height:  height,
+	}
+}
+
+// Init initializes the confirmation modal
+func (m *ConfirmModel) Init() tea.Cmd {
+	return nil
+}
+
+// Update handles messages for the confirmation modal
+func (m *ConfirmModel) Update(msg tea.Msg) (*ConfirmModel, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.KeyMsg:
+		switch msg.String() {
+		case "y", "Y", "left":
+			m.Yes = true
+		case "n", "N", "right":
+			m.Yes = false
+		case "enter":
+			// Confirmed - will be handled by parent
+			return m, nil
+		case "esc":
+			m.Visible = false
+			return m, nil
+		}
+	}
+	return m, nil
+}
+
+// View renders the confirmation modal
+func (m *ConfirmModel) View() string {
+	if !m.Visible {
+		return ""
+	}
+
+	// Build modal content
+	content := lipgloss.JoinVertical(
+		lipgloss.Left,
+		confirmTitleStyle.Render("⚠️  Confirm Action"),
+		"",
+		confirmMessageStyle.Render(m.Message),
+		"",
+		m.renderOptions(),
+	)
+
+	// Apply modal style
+	modal := confirmModalStyle.Render(content)
+
+	// Center modal on screen
+	modalWidth := lipgloss.Width(modal)
+	modalHeight := lipgloss.Height(modal)
+
+	x := (m.Width - modalWidth) / 2
+	if x < 0 {
+		x = 0
+	}
+	y := (m.Height - modalHeight) / 2
+	if y < 0 {
+		y = 0
+	}
+
+	return lipgloss.Place(m.Width, m.Height,
+		lipgloss.Left, lipgloss.Top,
+		modal,
+		lipgloss.WithWhitespaceChars(" "),
+		lipgloss.WithWhitespaceForeground(lipgloss.Color("235")),
+	)
+}
+
+// renderOptions renders the yes/no options
+func (m *ConfirmModel) renderOptions() string {
+	yesStyle := lipgloss.NewStyle().Foreground(lipgloss.Color("241"))
+	noStyle := lipgloss.NewStyle().Foreground(lipgloss.Color("241"))
+
+	selectedStyle := lipgloss.NewStyle().
+		Foreground(lipgloss.Color("57")).
+		Bold(true).
+		Underline(true)
+
+	var yesText, noText string
+	if m.Yes {
+		yesText = selectedStyle.Render("[Yes]")
+		noText = noStyle.Render(" No ")
+	} else {
+		yesText = yesStyle.Render(" Yes ")
+		noText = selectedStyle.Render("[No]")
+	}
+
+	helpText := confirmHelpStyle.Render("←/→ to choose • Enter to confirm • Esc to cancel")
+
+	return lipgloss.JoinHorizontal(lipgloss.Left, yesText, "  ", noText, "\n", helpText)
+}
+
+// IsConfirmed returns true if user confirmed with Yes
+func (m *ConfirmModel) IsConfirmed() bool {
+	return m.Yes
+}
+
+// IsCancelled returns true if user cancelled
+func (m *ConfirmModel) IsCancelled() bool {
+	return !m.Visible
+}