netbird-install-update: add install/update script with remote deployment and auto-update timers

- Detects Netbird installation method (binary vs package manager)
- Replaces package manager installs with binary for consistency
- Supports single-host and multi-host SSH deployment
- Adds systemd timer for daily auto-updates with persistent scheduling
- Handles sudo password automation via --password flag or hosts file
- Connection-safe updates using background execution to survive SSH disconnects
- Fixes SELinux contexts and binary permissions automatically
- Provides detailed deployment summaries with per-host action tracking
- Includes SSH timeout handling to prevent hanging on unreachable hosts
- Color-coded output with icons for better readability

README.md

@@ -11,6 +11,7 @@ A collection of utility scripts for Linux desktop and server administration.
 | [`docker-stacks-backup/`](docker-stacks-backup/) | Backup & restore Docker Compose stacks — named volumes, bind mounts, pre/post hooks, retention, integrity verification |
 | [`docker-stacks-update/`](docker-stacks-update/) | Discover running Compose stacks, pull latest images, and restart only those that changed |
 | [`input-remapper-switcher/`](input-remapper-switcher/) | Auto-switch [input-remapper](https://github.com/sezanzeb/input-remapper) presets per-application via Hyprland socket events |
+| [`netbird-install-update/`](netbird-install-update/) | Install, update, and manage Netbird across single or multiple Linux hosts — detects install method, replaces package-manager installs with binary, supports SSH remote deployment, auto-update timers, and sudo password automation |
 | [`proxmox-backup/`](proxmox-backup/) | Backup & restore Proxmox VE configuration (local or over SSH) with integrity verification |
 | [`proxmox-cloudimg/`](proxmox-cloudimg/) | Download, customize, and create Proxmox VE VM templates from official cloud images |
 | [`zsh/`](zsh/) | Zsh configuration (`.zshrc`), dependency bootstrap installer, and themed tmux config |