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/oam/apply

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# KNEL OAM Module
+# Operations and Maintenance Module
+
+set -euo pipefail
+
+echo "Running OAM module..."
+
+# Setup up2date script
+if [[ -f ./scripts/up2date.sh ]]; then
+    cp ./scripts/up2date.sh /usr/local/bin/up2date.sh
+    chmod +x /usr/local/bin/up2date.sh
+fi
+
+# Configure LibreNMS if this is not a LibreNMS server
+if [[ $LIBRENMS_CHECK -eq 0 ]]; then
+    # Install rsyslog if needed
+    apt-get update
+    apt-get install -y rsyslog
+    
+    # Restart rsyslog
+    systemctl stop rsyslog
+    systemctl start rsyslog
+fi
+
+echo "OAM module completed"