Add intelligent system detection and Proxmox support

New features:
- detect-system.sh: Automatically detects target system type
  - Proxmox VE
  - pfSense
  - TrueNAS
  - UCS
  - Unknown/generic

- deploy-proxmox.sh: Automated Proxmox certificate deployment
  - Backs up existing certificates
  - Installs certificate to /etc/pve/local/pveproxy-ssl.*
  - Restarts pveproxy service
  - Fully automated deployment

- cert-manager.py enhancements:
  - Detects system type before proceeding
  - Uses system-specific deployment scripts when available
  - Shows detected system type in summary
  - Intelligent deployment based on system capabilities
  - Manual deployment instructions for unsupported systems

deploy-proxmox.sh

@@ -0,0 +1,68 @@
+#!/bin/bash
+# Deploy certificate to Proxmox host
+# Usage: ./deploy-proxmox.sh <hostname> <cert-file> <key-file> <short-name>
+
+set -e
+
+TARGET_HOST="$1"
+CERT_FILE="$2"
+KEY_FILE="$3"
+SHORT_NAME="$4"
+
+if [ $# -lt 4 ]; then
+    echo "Usage: $0 <hostname> <cert-file> <key-file> <short-name>"
+    exit 1
+fi
+
+echo "=========================================="
+echo "Proxmox Certificate Deployment"
+echo "=========================================="
+echo "Target:      $TARGET_HOST"
+echo "Certificate: $CERT_FILE"
+echo "Key file:    $KEY_FILE"
+echo "=========================================="
+echo ""
+
+# Backup existing certificates
+echo "[1/5] Backing up existing Proxmox certificates..."
+ssh root@${TARGET_HOST} "cp /etc/pve/local/pveproxy-ssl.pem /etc/pve/local/pveproxy-ssl.pem.bak.$(date +%Y%m%d-%H%M%S) 2>/dev/null || true"
+ssh root@${TARGET_HOST} "cp /etc/pve/local/pveproxy-ssl.key /etc/pve/local/pveproxy-ssl.key.bak.$(date +%Y%m%d-%H%M%S) 2>/dev/null || true"
+
+# Copy certificate to target
+echo "[2/5] Copying certificate to Proxmox..."
+scp "$CERT_FILE" root@${TARGET_HOST}:/tmp/${SHORT_NAME}.crt
+
+# Copy or retrieve key
+echo "[3/5] Copying private key to Proxmox..."
+if [ -f "$KEY_FILE" ]; then
+    scp "$KEY_FILE" root@${TARGET_HOST}:/tmp/${SHORT_NAME}.key
+else
+    echo "Note: Key file should already be on target at /tmp/${SHORT_NAME}.key"
+fi
+
+# Install certificate
+echo "[4/5] Installing certificate for Proxmox web interface..."
+ssh root@${TARGET_HOST} "cat /tmp/${SHORT_NAME}.crt > /etc/pve/local/pveproxy-ssl.pem && \
+    cat /tmp/${SHORT_NAME}.key > /etc/pve/local/pveproxy-ssl.key && \
+    chmod 640 /etc/pve/local/pveproxy-ssl.pem && \
+    chmod 640 /etc/pve/local/pveproxy-ssl.key"
+
+# Restart Proxmox web service
+echo "[5/5] Restarting Proxmox web interface..."
+ssh root@${TARGET_HOST} "systemctl restart pveproxy.service"
+
+echo ""
+echo "=========================================="
+echo "✓ Proxmox certificate deployed!"
+echo "=========================================="
+echo ""
+echo "Certificate installed at:"
+echo "  /etc/pve/local/pveproxy-ssl.pem"
+echo "  /etc/pve/local/pveproxy-ssl.key"
+echo ""
+echo "Backup created at:"
+echo "  /etc/pve/local/pveproxy-ssl.pem.bak.*"
+echo "  /etc/pve/local/pveproxy-ssl.key.bak.*"
+echo ""
+echo "Access Proxmox at: https://${TARGET_HOST}:8006"
+echo "=========================================="