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/ssh-keys/apply

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+# KNEL SSH Keys Initializer
+# Sets up SSH authorized keys for users
+
+set -euo pipefail
+
+echo "Running SSH keys initializer..."
+
+# Create SSH directories
+mkdir -p $ROOT_SSH_DIR
+
+# Setup root SSH keys
+if [[ -f ./configs/root-ssh-authorized-keys ]]; then
+    cp ./configs/root-ssh-authorized-keys $ROOT_SSH_DIR/authorized_keys
+    chmod 400 $ROOT_SSH_DIR/authorized_keys
+    chown root: $ROOT_SSH_DIR/authorized_keys
+fi
+
+# Setup localuser SSH keys
+if [[ $LOCALUSER_CHECK -gt 0 ]]; then
+    mkdir -p $LOCALUSER_SSH_DIR
+    
+    if [[ -f ./configs/localuser-ssh-authorized-keys ]]; then
+        cp ./configs/localuser-ssh-authorized-keys $LOCALUSER_SSH_DIR/authorized_keys
+        chmod 400 $LOCALUSER_SSH_DIR/authorized_keys
+        chown localuser $LOCALUSER_SSH_DIR/authorized_keys
+    fi
+fi
+
+# Setup subodev SSH keys
+if [[ $SUBODEV_CHECK -gt 0 ]]; then
+    mkdir -p $SUBODEV_SSH_DIR
+    
+    if [[ -f ./configs/localuser-ssh-authorized-keys ]]; then
+        cp ./configs/localuser-ssh-authorized-keys $SUBODEV_SSH_DIR/authorized_keys
+        chmod 400 $SUBODEV_SSH_DIR/authorized_keys
+        chown subodev: $SUBODEV_SSH_DIR/authorized_keys
+    fi
+fi
+
+echo "SSH keys initializer completed"

initializers/ssh-keys/configs/localuser-ssh-authorized-keys

@@ -0,0 +1,2 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDHaBNuLS+GYGRPc9wne63Ocr+R+/Q01Y9V0FTv0RnG3
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPyMR0lFgiMKhQJ5aqy68nR0BQp1cNzi/wIThyuTV4a8 tsyscto@ultix-control

initializers/ssh-keys/configs/root-ssh-authorized-keys

@@ -0,0 +1,2 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIDHaBNuLS+GYGRPc9wne63Ocr+R+/Q01Y9V0FTv0RnG3
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPyMR0lFgiMKhQJ5aqy68nR0BQp1cNzi/wIThyuTV4a8 tsyscto@ultix-control