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/config/config.go

@@ -0,0 +1,33 @@
+package config
+
+import (
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	BackendURL      string `yaml:"backend_url"`
+	APIKey          string `yaml:"api_key"`
+	IntervalSeconds int    `yaml:"interval_seconds"`
+	AgentName       string `yaml:"agent_name"`
+	Insecure        bool   `yaml:"insecure"`
+}
+
+func Load(path string) (*Config, error) {
+	cfg := &Config{
+		IntervalSeconds: 60,
+		Insecure:        true,
+	}
+
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := yaml.Unmarshal(data, cfg); err != nil {
+		return nil, err
+	}
+
+	return cfg, nil
+}