Linux/Proxmox Agent + Plattform-Updater + Proxmox Frontend

- agent-linux/: Kompletter Linux/Proxmox RMM Agent
  - Collectors: CPU, Memory, Disk, Network, Services, Updates, Proxmox (VMs, Container, Storage, ZFS), Backups
  - Backup Collector: Jobs nach Node gefiltert (Cluster-aware)
  - WebSocket: Tunnel-Support, writeMux fuer stabile Verbindungen
  - Systemd Service Template

- updater/: Plattform-unabhaengiger Updater (FreeBSD + Linux)
  - runtime.GOOS erkennt Plattform automatisch
  - FreeBSD: /usr/local/rmm/, service rmm_agent
  - Linux: /usr/local/bin/, /etc/rmm/, systemctl rmm-agent
  - Firmware-Download mit ?platform= Parameter

- frontend/: Proxmox-Bereich
  - ProxmoxServers.jsx: Eigene Seite fuer PVE Server mit VM/CT Counts
  - ProxmoxPanel.jsx: Detail-Panel mit Uebersicht, VMs, Container, Storage, ZFS, Tunnel, Dienste, Updates, Backups
  - Agents.jsx: Filtert Linux-Agents raus (nur OPNsense)
  - Sidebar: Proxmox Navigationspunkt
  - Installationsanleitung mit rmm-agent-linux + rmm-updater-linux

- backend: Platform-Feld fuer Agents, Firmware multi-platform

agent-linux/rmm-agent-linux.service

@@ -0,0 +1,24 @@
+[Unit]
+Description=RMM Agent Linux
+After=network.target
+
+[Service]
+Type=simple
+User=root
+WorkingDirectory=/etc/rmm
+ExecStart=/usr/local/bin/rmm-agent-linux -config /etc/rmm/config.yaml
+Restart=always
+RestartSec=5
+
+# Security settings
+NoNewPrivileges=false
+PrivateNetwork=false
+PrivateTmp=true
+ProtectSystem=false
+ProtectHome=false
+
+# Allow access to hardware info and system stats
+SupplementaryGroups=
+
+[Install]
+WantedBy=multi-user.target