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

cmd/wg-tui/main.go

@@ -60,6 +60,11 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			// Switch to list screen
 			m.currentScreen = screens.NewListScreen()
 			return m, m.currentScreen.Init()
+		case "a":
+			// Switch to add screen
+			m.previousScreen = m.currentScreen
+			m.currentScreen = screens.NewAddScreen()
+			return m, m.currentScreen.Init()
 		}
 	case screens.ClientSelectedMsg:
 		// User selected a client - show detail screen
@@ -70,6 +75,14 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		// Client was deleted - show success message and return to list
 		m.currentScreen = screens.NewListScreen()
 		return m, m.currentScreen.Init()
+	case screens.ClientCreatedMsg:
+		// Client was created - return to list screen
+		m.currentScreen = screens.NewListScreen()
+		return m, m.currentScreen.Init()
+	case screens.RestoreCompletedMsg:
+		// Restore completed - return to list screen to refresh clients
+		m.currentScreen = screens.NewListScreen()
+		return m, m.currentScreen.Init()
 	case screens.CloseDetailScreenMsg:
 		// Detail screen closed - go back to previous screen
 		if m.previousScreen != nil {