feat(httpapi): return replica docker install commands on speaker create

После создания реплики 201 отдаёт agent_secret, node_token и install.docker_commands (bird2 + agent + Traefik DNS-01). UI показывает шаг установки вместо закрытия диалога, чтобы секрет больше не терялся.

Co-authored-by: Cursor <[email protected]>

internal/speakerinstall/install_test.go

@@ -0,0 +1,66 @@
+package speakerinstall
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestBuild_includesTraefikDNS01(t *testing.T) {
+	res, err := Build(Params{
+		SpeakerID:        "11111111-1111-1111-1111-111111111111",
+		AgentSecret:      "secret-abc",
+		NodeToken:        "node-tok",
+		BundlePubkey:     "pubkey==",
+		ControlPlaneURL:  "https://cp.example.com",
+		AgentDomain:      "bgp-dc2.example.com",
+		LetsEncryptEmail: "[email protected]",
+		CFDNSAPIToken:    "cf-token-xyz",
+		PanelIPWhitelist: "203.0.113.1/32",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	cmd := res.DockerCommands
+	for _, want := range []string{
+		"traefik",
+		"dnschallenge=true",
+		"dnschallenge.provider=cloudflare",
+		"CF_DNS_API_TOKEN",
+		"cf-token-xyz",
+		"Host(`bgp-dc2.example.com`)",
+		"secret-abc",
+		"node-tok",
+		"https://cp.example.com",
+		"docker compose up -d",
+		"sysctl -w net.ipv4.ip_forward=1",
+		"evobgp_speaker_traefik_letsencrypt",
+	} {
+		if !strings.Contains(cmd, want) {
+			t.Errorf("docker_commands missing %q", want)
+		}
+	}
+	if strings.Contains(cmd, "?set ") {
+		t.Error("compose must bake values, not ${VAR:?set VAR}")
+	}
+	if res.ComposeYAML == "" {
+		t.Fatal("compose_yaml empty")
+	}
+}
+
+func TestBuild_placeholdersWhenEmpty(t *testing.T) {
+	res, err := Build(Params{SpeakerID: "id", AgentSecret: "s", NodeToken: "t", BundlePubkey: "p"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, ph := range []string{
+		placeholderAgentDomain,
+		placeholderLetsEncryptEmail,
+		placeholderCFDNSToken,
+		placeholderPanelIP,
+		placeholderControlPlaneURL,
+	} {
+		if !strings.Contains(res.DockerCommands, ph) {
+			t.Errorf("expected placeholder %s", ph)
+		}
+	}
+}