feat(remote-speakers): enhance remote speaker management and API integration

- Added support for remote speaker configuration in the README and documentation.
- Implemented a new endpoint for retrieving the bundle signing public key.
- Updated the `evobgp-agent` to include a `serve` command for Panel→Node sync API.
- Enhanced CI workflow to validate remote speaker compose files.
- Introduced new fields in the API and UI for managing speaker metadata, including dispatch status and sync status.
- Improved error handling and response formatting in speaker-related API endpoints.
- Updated documentation to reflect changes in remote speaker functionality and usage guidelines.

internal/store/speaker_meta_test.go

@@ -0,0 +1,36 @@
+package store_test
+
+import (
+	"testing"
+
+	"evobgp/internal/store"
+)
+
+func TestParseSpeakerMeta_defaults(t *testing.T) {
+	t.Parallel()
+	m := store.ParseSpeakerMeta(`{"agent_domain":"bgp1.example.com"}`)
+	if m.AgentPort != 8443 {
+		t.Fatalf("default port: got %d", m.AgentPort)
+	}
+	if m.AgentDomain != "bgp1.example.com" {
+		t.Fatalf("domain: %q", m.AgentDomain)
+	}
+}
+
+func TestIPv4FromEndpoint(t *testing.T) {
+	t.Parallel()
+	if got := store.IPv4FromEndpoint("https://203.0.113.10:8443"); got != "203.0.113.10" {
+		t.Fatalf("got %q", got)
+	}
+	if got := store.IPv4FromEndpoint("bgp-dc2.example.com"); got != "" {
+		t.Fatalf("hostname should be empty, got %q", got)
+	}
+}
+
+func TestAgentSyncURL(t *testing.T) {
+	t.Parallel()
+	u := store.AgentSyncURL(store.SpeakerMeta{AgentDomain: "node.example.com"})
+	if u != "https://node.example.com/v1/agent/sync" {
+		t.Fatalf("got %q", u)
+	}
+}