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

netbird-install-update/hosts.example

@@ -0,0 +1,17 @@
+# Example hosts file for netbird-install-update.sh
+# Format: hostname [sudo_password]
+# One host per line, comments start with #
+# Host-specific passwords override --password flag
+
+# Production servers (with host-specific sudo passwords)
+prod-web-01.jeremy.skynet MySudoPassword123
+prod-web-02.jeremy.skynet MySudoPassword123
+prod-db-01.jeremy.skynet MySudoPassword123
+
+# Development servers (will use --password flag or prompt interactively)
+dev-app-01.jeremy.skynet
+dev-app-02.jeremy.skynet
+
+# You can also use IP addresses
+# 192.168.1.100
+# 10.0.0.50 MyPassword