Recon network batch 2: fleet relay scan and UDP hints.

POST /api/v1/recon/relay-scan probes from the dashboard when reachable, otherwise dispatches recon_relay_scan to a same-/24 online agent. Agents reuse probePortsFn for TCP and optionally UDP 53/51820 with dns/wireguard Path Tracer tags.

agent/client/recon_relay_scan_test.go

@@ -0,0 +1,57 @@
+package client
+
+import (
+	"encoding/json"
+	"testing"
+
+	"crypto-miner-agent/deploy"
+)
+
+func TestHandleReconRelayScanCommand(t *testing.T) {
+	deploy.SetProbePortsHook(func(host string, ports []int) []int {
+		if host == "10.1.2.3" {
+			return []int{22, 445}
+		}
+		return nil
+	})
+	t.Cleanup(func() { deploy.SetProbePortsHook(nil) })
+	deploy.SetRelayUDPGuessHook(func(host string, ports []int) []deploy.RelayUDPHint {
+		return []deploy.RelayUDPHint{{Port: 51820, Open: true, Service: "wireguard"}}
+	})
+	t.Cleanup(func() { deploy.SetRelayUDPGuessHook(nil) })
+
+	var gotAction string
+	var gotSuccess bool
+	var gotMsg string
+	c := &AgentClient{}
+	c.commandResultHook = func(action string, success bool, message string) {
+		gotAction, gotSuccess, gotMsg = action, success, message
+	}
+
+	if !c.handleReconCommand("recon_relay_scan", "10.1.2.3", "true") {
+		t.Fatal("expected handled")
+	}
+	if gotAction != "recon_relay_scan" || !gotSuccess {
+		t.Fatalf("action=%s success=%v", gotAction, gotSuccess)
+	}
+	var parsed map[string]interface{}
+	if err := json.Unmarshal([]byte(gotMsg), &parsed); err != nil {
+		t.Fatal(err)
+	}
+	ports, _ := parsed["open_ports"].([]interface{})
+	if len(ports) != 2 {
+		t.Fatalf("ports=%v", ports)
+	}
+}
+
+func TestHandleReconRelayScanMissingHost(t *testing.T) {
+	c := &AgentClient{}
+	c.commandResultHook = func(action string, success bool, _ string) {
+		if action != "recon_relay_scan" || success {
+			t.Fatalf("action=%s success=%v", action, success)
+		}
+	}
+	if !c.handleReconCommand("recon_relay_scan", "", "") {
+		t.Fatal("expected handled")
+	}
+}