refactor: Remove librenms, add ansible/salt clients

- Remove all librenms references from initializers and configuration
- Keep tailscale as requested (remove netbird plans)
- Add ansible-core (already present) and salt-minion packages
- Create salt-client initializer for minion configuration
- Update roles to replace librenms-agent with salt-client
- Simplify oam initializer to only handle up2date script
- Update README to reflect new architecture and tools

Prepares infrastructure for migration to Salt configuration management
while maintaining tailscale for VPN connectivity.

💘 Generated with Crush

Assisted-by: GLM-4.6 via Crush <crush@charm.land>

initializers/system-config/apply

@@ -0,0 +1,96 @@
+#!/bin/bash
+
+# KNEL System Configuration Initializer
+# Applies system-wide configuration files with conditional logic
+
+set -euo pipefail
+
+echo "Running system configuration initializer..."
+
+# Create necessary directories
+mkdir -p $ROOT_SSH_DIR
+
+# Deploy system configuration files from copied templates
+if [[ -f ./ConfigFiles/ZSH/tsys-zshrc ]]; then
+    cp ./ConfigFiles/ZSH/tsys-zshrc /etc/zshrc
+fi
+
+if [[ -f ./ConfigFiles/SMTP/aliases ]]; then
+    cp ./ConfigFiles/SMTP/aliases /etc/aliases
+    newaliases
+fi
+
+if [[ -f ./ConfigFiles/Syslog/rsyslog.conf ]]; then
+    cp ./ConfigFiles/Syslog/rsyslog.conf > /etc/rsyslog.conf
+fi
+
+# Configure DHCP client
+if [[ -f ./ConfigFiles/DHCP/dhclient.conf ]]; then
+    cp ./ConfigFiles/DHCP/dhclient.conf > /etc/dhcp/dhclient.conf
+fi
+
+# Configure SNMP
+systemctl stop snmpd 2>/dev/null || true
+/etc/init.d/snmpd stop 2>/dev/null || true
+
+if [[ -f ./ConfigFiles/SNMP/snmp-sudo.conf ]]; then
+    cp ./ConfigFiles/SNMP/snmp-sudo.conf > /etc/sudoers.d/Debian-snmp
+fi
+
+# Adjust SNMP service for log verbosity
+sed -i "s|-Lsd|-LS6d|" /lib/systemd/system/snmpd.service
+
+# Configure SNMP based on system type (with pi-detect)
+if command -v vcgencmd >/dev/null 2>&1; then
+    export IS_RASPI="1"
+else
+    export IS_RASPI="0"
+fi
+
+if [[ $IS_RASPI -eq 1 ]] && [[ -f ./ConfigFiles/SNMP/snmpd-rpi.conf ]]; then
+    cp ./ConfigFiles/SNMP/snmpd-rpi.conf /etc/snmp/snmpd.conf
+elif [[ $IS_PHYSICAL_HOST -eq 1 ]] && [[ -f ./ConfigFiles/SNMP/snmpd-physicalhost.conf ]]; then
+    cp ./ConfigFiles/SNMP/snmpd-physicalhost.conf /etc/snmp/snmpd.conf
+elif [[ $IS_VIRT_GUEST -eq 1 ]] && [[ -f ./ConfigFiles/SNMP/snmpd.conf ]]; then
+    cp ./ConfigFiles/SNMP/snmpd.conf /etc/snmp/snmpd.conf
+fi
+
+# Configure lldpd
+if [[ -f ./ConfigFiles/NetworkDiscovery/lldpd ]]; then
+    cp ./ConfigFiles/NetworkDiscovery/lldpd /etc/default/lldpd
+    systemctl restart lldpd
+fi
+
+# Configure Cockpit
+if [[ -f ./ConfigFiles/Cockpit/disallowed-users ]]; then
+    cp ./ConfigFiles/Cockpit/disallowed-users /etc/cockpit/disallowed-users
+    systemctl restart cockpit
+fi
+
+# Configure NTP for non-NTP servers
+if [[ $NTP_SERVER_CHECK -eq 0 ]] && [[ -f ./ConfigFiles/NTP/ntp.conf ]]; then
+    cp ./ConfigFiles/NTP/ntp.conf /etc/ntpsec/ntp.conf
+    systemctl restart ntpsec.service
+fi
+
+# Always install rsyslog (removed librenms conditional)
+DEBIAN_FRONTEND="noninteractive" apt-get -qq --yes -o Dpkg::Options::="--force-confold" install rsyslog
+systemctl stop rsyslog
+systemctl start rsyslog
+
+# Reload systemd and restart SNMP
+systemctl daemon-reload
+systemctl restart snmpd 2>/dev/null || true
+/etc/init.d/snmpd restart 2>/dev/null || true
+
+# Performance tuning based on system type
+if [[ $IS_PHYSICAL_HOST -gt 0 ]]; then
+    cpufreq-set -r -g performance
+    cpupower frequency-set --governor performance
+fi
+
+if [[ $IS_VIRT_GUEST -eq 1 ]]; then
+    tuned-adm profile virtual-guest
+fi
+
+echo "System configuration initializer completed"