Refactor stations discovery and add hostapd discovery

internal/station/factory.go

@@ -0,0 +1,24 @@
+package station
+
+import (
+	"fmt"
+
+	"github.com/nemunaire/repeater/internal/station/arp"
+	"github.com/nemunaire/repeater/internal/station/backend"
+	"github.com/nemunaire/repeater/internal/station/dhcp"
+	"github.com/nemunaire/repeater/internal/station/hostapd"
+)
+
+// createBackend creates a station backend based on the backend name
+func createBackend(backendName string) (backend.StationBackend, error) {
+	switch backendName {
+	case "arp":
+		return arp.NewBackend(), nil
+	case "dhcp":
+		return dhcp.NewBackend(), nil
+	case "hostapd":
+		return hostapd.NewBackend(), nil
+	default:
+		return nil, fmt.Errorf("invalid station backend: %s (must be 'arp', 'dhcp', or 'hostapd')", backendName)
+	}
+}