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/nodecli/sync.go

@@ -0,0 +1,118 @@
+package nodecli
+
+import (
+	"context"
+	"crypto/ed25519"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"evobgp/internal/birdfmt"
+	"evobgp/internal/bundle"
+	"evobgp/internal/signing"
+)
+
+// SyncConfig drives pull → verify → apply on a replica node.
+type SyncConfig struct {
+	BaseURL      string
+	Token        string
+	SpeakerID    string
+	RevisionID   string // empty = latest published on CP
+	PubKeyB64    string
+	PubKeyHex    string
+	ExtractDir   string
+	BundlePath   string // temp file; default os.TempDir()/evobgp-bundle.tar.gz
+	BirdBin      string
+	BirdcBin     string
+	Socket       string
+	HTTPClient   interface {
+		Do(req interface{}) (interface{}, error)
+	}
+	Timeout time.Duration
+}
+
+// SyncResult summarizes a successful sync.
+type SyncResult struct {
+	RevisionID string `json:"revision_id"`
+	MainConfig string `json:"main_config,omitempty"`
+}
+
+// SyncBundle pulls (if needed), verifies Ed25519 signature, extracts, parse-checks, and birdc configure.
+func SyncBundle(ctx context.Context, cfg SyncConfig) (SyncResult, error) {
+	if strings.TrimSpace(cfg.BaseURL) == "" || strings.TrimSpace(cfg.Token) == "" || strings.TrimSpace(cfg.SpeakerID) == "" {
+		return SyncResult{}, fmt.Errorf("nodecli: sync: base-url, token, speaker-id required")
+	}
+	if strings.TrimSpace(cfg.ExtractDir) == "" {
+		return SyncResult{}, fmt.Errorf("nodecli: sync: extract-dir required")
+	}
+	pub, err := loadPubKey(cfg.PubKeyB64, cfg.PubKeyHex)
+	if err != nil {
+		return SyncResult{}, fmt.Errorf("nodecli: sync: %w", err)
+	}
+	timeout := cfg.Timeout
+	if timeout <= 0 {
+		timeout = 30 * time.Second
+	}
+	rev := strings.TrimSpace(cfg.RevisionID)
+	if rev == "" {
+		var err error
+		rev, err = fetchLatestRevision(cfg.BaseURL, cfg.Token, cfg.SpeakerID)
+		if err != nil {
+			return SyncResult{}, err
+		}
+	}
+	raw, err := fetchBundle(cfg.BaseURL, cfg.Token, cfg.SpeakerID, rev)
+	if err != nil {
+		return SyncResult{}, err
+	}
+	bundlePath := strings.TrimSpace(cfg.BundlePath)
+	if bundlePath == "" {
+		bundlePath = filepath.Join(os.TempDir(), "evobgp-bundle.tar.gz")
+	}
+	if err := os.WriteFile(bundlePath, raw, 0o644); err != nil {
+		return SyncResult{}, err
+	}
+	v, err := signing.VerifyGzippedTar(raw, pub)
+	if err != nil {
+		return SyncResult{}, err
+	}
+	root := filepath.Clean(cfg.ExtractDir)
+	if err := os.MkdirAll(root, 0o755); err != nil {
+		return SyncResult{}, err
+	}
+	if err := bundle.WriteExtractedFiles(root, v); err != nil {
+		return SyncResult{}, err
+	}
+	mainRel := v.FindMainBirdConf()
+	if mainRel == "" {
+		return SyncResult{}, fmt.Errorf("nodecli: sync: bundle has no bird.conf in manifest")
+	}
+	mainPath := filepath.Join(root, filepath.FromSlash(strings.TrimPrefix(mainRel, "/")))
+	opCtx, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+	ctl := &birdfmt.BirdCtl{Bird: cfg.BirdBin, Birdc: cfg.BirdcBin, Socket: cfg.Socket}
+	if err := ctl.ParseCheck(opCtx, mainPath); err != nil {
+		return SyncResult{}, err
+	}
+	if err := ctl.Configure(opCtx); err != nil {
+		return SyncResult{}, err
+	}
+	return SyncResult{RevisionID: rev, MainConfig: mainPath}, nil
+}
+
+// SyncResultJSON encodes SyncResult for HTTP responses.
+func SyncResultJSON(r SyncResult) ([]byte, error) {
+	return json.Marshal(map[string]any{
+		"ok":                true,
+		"applied_revision_id": r.RevisionID,
+		"main_config":       r.MainConfig,
+	})
+}
+
+// LoadPublicKey exports loadPubKey for other packages.
+func LoadPublicKey(pubB64, pubHex string) (ed25519.PublicKey, error) {
+	return loadPubKey(pubB64, pubHex)
+}