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/packages/apply

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # KNEL Package Installation
-# This initializer installs required packages
+# This initializer installs required packages with conditional logic
 
 set -euo pipefail
 
@@ -21,6 +21,7 @@ sh /tmp/webmin-setup.sh -f && rm -f /tmp/webmin-setup.sh
 curl -fsSL https://tailscale.com/install.sh | sh
 
 # Remove unwanted packages
+export DEBIAN_FRONTEND="noninteractive"
 apt-get -y --purge remove \
     systemd-timesyncd \
     chrony \
@@ -35,7 +36,7 @@ apt-get -y --purge remove \
 apt-get --purge autoremove
 
 # Install desired packages
-apt-get install -y \
+apt-get -y -o Dpkg::Options::="--force-confold" install \
     virt-what \
     auditd \
     audispd-plugins \
@@ -68,6 +69,7 @@ apt-get install -y \
     command-not-found \
     lldpd \
     ansible-core \
+    salt-minion \
     net-tools \
     dos2unix \
     gpg \
@@ -103,19 +105,19 @@ apt-get install -y \
 
 # Kali-specific packages
 if [[ $KALI_CHECK -eq 0 ]]; then
-    apt-get install -y \
+    apt-get -y -o Dpkg::Options::="--force-confold" install \
         latencytop \
         cockpit-tests
 fi
 
 # KVM guest specific packages
 if [[ $IS_KVM_GUEST -eq 1 ]]; then
-    apt-get install -y qemu-guest-agent
+    apt-get -y install qemu-guest-agent
 fi
 
 # Physical host specific packages
 if [[ $IS_PHYSICAL_HOST -gt 0 ]]; then
-    apt-get install -y \
+    apt-get -y -o Dpkg::Options::="--force-confold" install \
         i7z \
         thermald \
         cpufrequtils \