Initial port of KNELServerBuild to FetchApply framework

- Created base FetchApply directory structure with classes, initializers, modules, roles, and variables
- Ported SetupNewSystem.sh functionality to modular FetchApply structure
- Created server classes: physical, virtual, librenms, database, webserver, dev-workstation
- Implemented initializers for system-setup, packages, ssh-keys, and user-configuration
- Created modules for oam, system-config, ssh-hardening, and librenms-agent
- Defined security and monitoring roles
- Copied configuration templates from KNELServerBuild
- Updated README with comprehensive FetchApply usage instructions

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

modules/librenms-agent/apply

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# KNEL LibreNMS Agent Module
+# Deploys and configures LibreNMS monitoring agent
+
+set -euo pipefail
+
+echo "Running LibreNMS agent module..."
+
+# Check if this is a LibreNMS server
+if [[ $LIBRENMS_CHECK -eq 1 ]]; then
+    echo "This is a LibreNMS server, skipping agent setup"
+    exit 0
+fi
+
+# Deploy LibreNMS agent configuration
+if [[ -f ./configs/librenms-agent.conf ]]; then
+    # Create agent directory if needed
+    mkdir -p /etc/librenms-agent
+    
+    # Copy agent configuration
+    cp ./configs/librenms-agent.conf /etc/librenms-agent/
+    
+    # Start the agent service if available
+    if systemctl list-unit-files | grep -q librenms-agent; then
+        systemctl enable librenms-agent
+        systemctl restart librenms-agent
+    fi
+fi
+
+echo "LibreNMS agent module completed"