feat(docs): update speaker installation instructions and logging details

- Enhanced the speaker installation documentation to clarify the use of TCP port 179 and the logging commands for monitoring BIRD and evobgp-agent.
- Updated the speaker form dialog to include additional information about MikroTik connections and logging commands.
- Modified the BIRD configuration to include logging to stderr for better visibility during operations.
- Adjusted the Docker Compose configuration to ensure proper network settings and sysctl configurations for BGP functionality.

internal/pipeline/speaker_overlay_test.go

@@ -40,3 +40,48 @@ func TestOverlayFragmentsForSpeaker_differentRouterID(t *testing.T) {
 		t.Fatalf("sp2 router: %s", out2["bird.conf"])
 	}
 }
+
+func TestOverlayFragmentsForSpeaker_nodeIPv4Fallback(t *testing.T) {
+	m := store.NewMemory()
+	m.SeedDemo()
+	tenant, _, _, _, _ := m.DemoIDs()
+	sp, err := m.CreateSpeaker(tenant, &store.Speaker{
+		Role:     "replica",
+		Endpoint: "https://node.example.com",
+		MetaJSON: `{"node_ipv4":"198.51.100.9"}`,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	out, err := pipeline.OverlayFragmentsForSpeaker(m, tenant, sp.ID, "rev1", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(out["bird.conf"], "198.51.100.9") {
+		t.Fatalf("expected node_ipv4 as router id, got: %s", out["bird.conf"])
+	}
+}
+
+func TestOverlayFragmentsForSpeaker_sourceOverridesNodeIPv4(t *testing.T) {
+	m := store.NewMemory()
+	m.SeedDemo()
+	tenant, _, _, _, _ := m.DemoIDs()
+	sp, err := m.CreateSpeaker(tenant, &store.Speaker{
+		Role:     "replica",
+		Endpoint: "https://node.example.com",
+		MetaJSON: `{"node_ipv4":"198.51.100.9","bird_bgp_source_ipv4":"203.0.113.40"}`,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	out, err := pipeline.OverlayFragmentsForSpeaker(m, tenant, sp.ID, "rev1", map[string]string{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(out["bird.conf"], "203.0.113.40") {
+		t.Fatalf("source should win: %s", out["bird.conf"])
+	}
+	if strings.Contains(out["bird.conf"], "198.51.100.9") {
+		t.Fatalf("node_ipv4 should not win over source: %s", out["bird.conf"])
+	}
+}