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
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