feat: implement full restore functionality with TUI integration

- Add complete restore engine (internal/restore/)
  - RestoreSingle() for single database restore
  - RestoreCluster() for full cluster restore
  - Archive format detection (7 formats supported)
  - Safety validation (integrity, disk space, tools)
  - Streaming decompression with pigz support

- Add CLI restore commands (cmd/restore.go)
  - restore single: restore single database backup
  - restore cluster: restore full cluster backup
  - restore list: list available backup archives
  - Safety-first design: dry-run by default, --confirm required

- Add TUI restore integration (internal/tui/)
  - Archive browser: browse and select backups
  - Restore preview: safety checks and confirmation
  - Restore execution: real-time progress tracking
  - Backup manager: comprehensive archive management

- Features:
  - Format auto-detection (.dump, .dump.gz, .sql, .sql.gz, .tar.gz)
  - Archive validation before restore
  - Disk space verification
  - Tool availability checks
  - Target database configuration
  - Clean-first and create-if-missing options
  - Parallel decompression support
  - Progress tracking with phases

Phase 1 (Core Functionality) complete and tested

internal/tui/menu.go

@@ -82,6 +82,11 @@ func NewMenuModel(cfg *config.Config, log logger.Logger) MenuModel {
 			"Single Database Backup",
 			"Sample Database Backup (with ratio)",
 			"Cluster Backup (all databases)",
+			"────────────────────────────────",
+			"Restore Single Database",
+			"Restore Cluster Backup",
+			"List & Manage Backups",
+			"────────────────────────────────",
 			"View Active Operations",
 			"Show Operation History",
 			"Database Status & Health Check",
@@ -153,17 +158,27 @@ func (m MenuModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				return m.handleSampleBackup()
 			case 2: // Cluster Backup
 				return m.handleClusterBackup()
-			case 3: // View Active Operations
+			case 3: // Separator
+				// Do nothing
+			case 4: // Restore Single Database
+				return m.handleRestoreSingle()
+			case 5: // Restore Cluster Backup
+				return m.handleRestoreCluster()
+			case 6: // List & Manage Backups
+				return m.handleBackupManager()
+			case 7: // Separator
+				// Do nothing
+			case 8: // View Active Operations
 				return m.handleViewOperations()
-			case 4: // Show Operation History
+			case 9: // Show Operation History
 				return m.handleOperationHistory()
-			case 5: // Database Status
+			case 10: // Database Status
 				return m.handleStatus()
-			case 6: // Settings
+			case 11: // Settings
 				return m.handleSettings()
-			case 7: // Clear History
+			case 12: // Clear History
 				m.message = "🗑️ History cleared"
-			case 8: // Quit
+			case 13: // Quit
 				if m.cancel != nil {
 					m.cancel()
 				}
@@ -281,6 +296,28 @@ func (m MenuModel) handleSettings() (tea.Model, tea.Cmd) {
 	return settingsModel, nil
 }
 
+// handleRestoreSingle opens archive browser for single restore
+func (m MenuModel) handleRestoreSingle() (tea.Model, tea.Cmd) {
+	browser := NewArchiveBrowser(m.config, m.logger, m, "restore-single")
+	return browser, browser.Init()
+}
+
+// handleRestoreCluster opens archive browser for cluster restore
+func (m MenuModel) handleRestoreCluster() (tea.Model, tea.Cmd) {
+	if !m.config.IsPostgreSQL() {
+		m.message = errorStyle.Render("❌ Cluster restore is available only for PostgreSQL")
+		return m, nil
+	}
+	browser := NewArchiveBrowser(m.config, m.logger, m, "restore-cluster")
+	return browser, browser.Init()
+}
+
+// handleBackupManager opens backup management view
+func (m MenuModel) handleBackupManager() (tea.Model, tea.Cmd) {
+	manager := NewBackupManager(m.config, m.logger, m)
+	return manager, manager.Init()
+}
+
 func (m *MenuModel) applyDatabaseSelection() {
 	if m == nil || len(m.dbTypes) == 0 {
 		return