feat: Windows Agent v1.0.0

- Windows-Dienst (golang.org/x/sys/windows/svc)
- Collector: CPU (GetSystemTimes), RAM (GlobalMemoryStatusEx), Disks (GetDiskFreeSpaceEx)
- WS-Client: gleiche Verbindungslogik wie Linux/BSD Agent
- Commands: exec, winget list/install/upgrade/upgrade-all, Windows Updates check/install, reboot
- install.ps1: automatische Service-Installation mit Parametern
- make agent-windows VERSION=x.x.x

agent-windows/config/config.go

@@ -0,0 +1,30 @@
+package config
+
+import (
+	"os"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Config struct {
+	BackendURL      string `yaml:"backend_url"`
+	APIKey          string `yaml:"api_key"`
+	AgentName       string `yaml:"agent_name"`
+	IntervalSeconds int    `yaml:"interval_seconds"`
+	Insecure        bool   `yaml:"insecure"`
+}
+
+func Load(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+	cfg := &Config{
+		IntervalSeconds: 60,
+		Insecure:        true,
+	}
+	if err := yaml.Unmarshal(data, cfg); err != nil {
+		return nil, err
+	}
+	return cfg, nil
+}