feat(api): enhance peer session management and documentation

- Added new fields to the API for tracking connected speakers and session states across multiple nodes, including `connected_speaker_id`, `connected_speaker_label`, `session_on_speakers`, `established_on_speakers`, and `session_mismatch`.
- Implemented a new endpoint for retrieving bird protocol sessions, enhancing the agent server functionality.
- Updated the OpenAPI documentation to reflect the new fields and query parameters, improving clarity for API consumers.
- Modified the frontend to display connected speaker information and session states, providing better visibility into peer connections.
- Updated deployment documentation to clarify the configuration requirements for enabling IP forwarding on VPS.

internal/pipeline/refresh.go

@@ -1029,7 +1029,7 @@ func renderPeersBirdFragment(st store.Backend, tenantID string, loc birdLocals)
 		}
 		pol := parsePeerPolicies(p.PoliciesJSON)
 		lv4, lv6, asn := effectivePeerLocals(loc, pol)
-		proto := peerProtocolName(p.ID)
+		proto := birdfmt.PeerProtocolName(p.ID)
 		ra := uint32(p.RemoteASN)
 		if addr.Is4() {
 			opts := birdfmt.BGPPeerFromTemplateOptions{
@@ -1083,17 +1083,6 @@ func parsePeerPolicies(raw string) peerPolicyJSON {
 	return pol
 }
 
-func peerProtocolName(peerID string) string {
-	s := strings.ReplaceAll(strings.TrimSpace(peerID), "-", "")
-	if len(s) > 16 {
-		s = s[:16]
-	}
-	if s == "" {
-		s = "x"
-	}
-	return "evobgp_p_" + s
-}
-
 // buildExpandedBirdText concatenates bird.conf and the contents of each standard include (for UI / preview).
 func buildExpandedBirdText(main string, frags map[string]string) string {
 	var b strings.Builder