feat: Add backup and security hardening

System-Overview.md

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+# System Overview
+
+## Project Overview
+
+Setting up a Lenovo ThinkPad as a rock-solid, minimal, high-performance
+development environment for professional software development.
+
+## Hardware Specifications
+
+- **Model**: Lenovo ThinkPad (14")
+- **CPU**: AMD Ryzen AI 7 PRO 350 (2.0-5.0 GHz)
+- **RAM**: 96GB DDR5-5600MHz (2x 48GB)
+- **Storage**: 512GB NVMe PCIe 4.0 TLC Opal SSD
+- **Display**: 14" 2.8K OLED (2880x1800) @ 30-120Hz VRR, HDR 500
+- **WiFi**: MediaTek Wi-Fi 7 MT7925 2x2 BE + Bluetooth 5.4
+- **Dock**: USB-C dock with DisplayLink
+- **External Monitors**: 2x Shenzhen KTC Q3212RUC (2560x1440 @ 59.95Hz)
+
+## Software Stack
+
+- **OS**: Gentoo Linux (OpenRC)
+- **Kernel**: 6.12.41-gentoo-x86_64 (manual compilation - genkernel NOT used)
+- **Display Server**: Wayland (no X11)
+- **Window Manager**: Hyprland 0.49.0 (no XWayland)
+- **Status Bar**: waybar (with Catppuccin Mocha theme)
+- **Terminal**: Ghostty (pure Wayland, no X11)
+- **Editor**: Neovim (with LSP support)
+- **File Manager**: Midnight Commander (mc)
+- **Init System**: OpenRC
+- **Session Manager**: elogind
+- **Network Manager**: NetworkManager
+- **Bluetooth**: BlueZ
+- **Dotfile Management**: chezmoi (cross-platform)
+- **Theme**: Catppuccin Mocha (consistent across all applications)
+
+## Development Focus
+
+- **Backend**: Go services
+- **Frontend**: Web applications
+- **Mobile**: Kotlin-based applications
+- **Systems**: C programming
+- **IoT**: Embedded electronics, firmware flashing
+
+## Design Philosophy
+
+1. **Minimal footprint** - No bloated desktop environments (GNOME/KDE)
+2. **Performance first** - Slim, fast, responsive
+3. **Wayland native** - Modern display protocol
+4. **Single-user system** - Optimized for alexander
+5. **Rock solid** - Stability and reliability over bleeding edge
+6. **Development focused** - All tools optimized for professional work
+
+## System Health
+
+**Overall Status**: 🟢 Excellent
+
+**Stability**: Rock solid
+**Performance**: Optimized
+**Battery Life**: 30-50% improvement (power profiles) + potentially 2x
+lifespan (conservation mode)
+**Hardware Support**: Complete (all input/output devices working)
+**Management Tools**: Complete suite of interactive scripts
+**Dotfile Management**: chezmoi configured and syncing across machines
+**Backup**: Automated NAS backups with network trigger
+**Security**: nftables firewall running (default deny incoming)
+**UI/Theme**: Professional Catppuccin Mocha theme with Nerd Font icons
+**Completeness**: ~99% (all core features complete, only development tools
+remaining)
+
+**Ready for production use!** 🚀
+
+## Documentation
+
+For complete system information, see:
+
+**Quick Reference & Status:**
+- **USER-GUIDE.md** - Quick reference for everyday tasks
+- **Feature-Status.md** - Current state, working features, session history
+- **Troubleshooting.md** - Troubleshooting commands and procedures
+
+**Complete Guides:**
+- **Backup-Setup.md** - Automated NAS backups, network trigger
+- **Security-Hardening.md** - Firewall, fail2ban, SSH hardening
+- **Power-Management-Setup.md** - Power management configuration
+- **Bluetooth-Setup.md** - Bluetooth setup and troubleshooting
+- **Dotfiles-Management.md** - Managing dotfiles with chezmoi
+
+**For Claude Code:**
+- **CLAUDE.md** - Operational guidelines for working on this project