feat(cluster): PG Logical Replication + VIP/Keepalived + config_hash sync (v1.2.1–1.2.2)

- PG Logical Replication: edgeguard_shared PUBLICATION auf Primary,
  edgeguard_sub SUBSCRIPTION auf Secondary. Nur geteilte Config-Tabellen
  werden repliziert; node-eigene Daten (network_interfaces, ip_addresses,
  static_routes, cluster_settings, dns_settings, ntp_settings) bleiben
  lokal — OPNsense-Muster.
- cluster-init-replication: Erstellt PUBLICATION, Rolle + pg_hba-Einträge
  (logical + replication), WAL-Level auf logical.
- cluster-setup-standby: Erstellt SUBSCRIPTION (copy_data=true), pollt
  pg_subscription_rel bis alle Tabellen sync = 'r', rendert dann Configs.
- promote: manueller Failover via pg_promote() + touch recovery.signal.
- VIP/Keepalived: cluster_settings-Tabelle (vip_address, vip_interface,
  vrrp_router_id), /cluster/vip-settings API, Keepalived-Config-Generator
  mit VRRP + check_script + notify-Skripten in /usr/lib/edgeguard/scripts/.
- config_hash sync: Secondary pusht alle 5 Min seinen Hash via mTLS an
  Primary (PushSelfToPrimary). Heartbeat schreibt nur LOCAL, daher ohne
  aktiven Push wäre Primary-Sicht des Secondary-Hash stale gewesen.
- runSecondaryConfigRender: Goroutine auf Secondary rendert HAProxy+nftables
  neu wenn config_hash sich ändert (Logical-Replication-Nachzügler).
- confighash: node-spezifische Tabellen aus hashSpec entfernt.
- postinst: Keepalived-Skripte installieren, sudoers für keepalived.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/services/clusterjoin/join.go

@@ -128,7 +128,7 @@ func Join(req Request) error {
 	// synchronous on the primary side.
 	var autoRegErr error
 	for i := 0; i < 3; i++ {
-		if err := autoRegister(primary, tlsDir, req.CommonName, req.Version, req.NodeID); err == nil {
+		if err := autoRegister(primary, tlsDir, req.CommonName, req.Version, req.NodeID, ""); err == nil {
 			autoRegErr = nil
 			break
 		} else {
@@ -217,7 +217,18 @@ func issueCert(primary, token, csr string, insecure bool) (caCert, peerCert stri
 	return env.Data.CACert, env.Data.PeerCert, nil
 }
 
-func autoRegister(primary, tlsDir, commonName, version, nodeID string) error {
+// PushSelfToPrimary sends this node's current identity + configHash to the
+// primary via mTLS. Exported for use by the API server's periodic push
+// goroutine so the primary's ha_nodes always reflects the secondary's actual
+// config_hash (not the stale join-time value).
+func PushSelfToPrimary(primaryURL, tlsDir, nodeID, fqdn, version, configHash string) error {
+	if tlsDir == "" {
+		tlsDir = clustertls.DefaultDir
+	}
+	return autoRegister(primaryURL, tlsDir, fqdn, version, nodeID, configHash)
+}
+
+func autoRegister(primary, tlsDir, commonName, version, nodeID, configHash string) error {
 	u, err := url.Parse(primary)
 	if err != nil {
 		return err
@@ -231,11 +242,12 @@ func autoRegister(primary, tlsDir, commonName, version, nodeID string) error {
 	}
 	hostname, _ := os.Hostname()
 	body, _ := json.Marshal(map[string]string{
-		"id":      nodeID,
-		"name":    hostname,
-		"fqdn":    commonName,
-		"api_url": "https://" + commonName + ":3443",
-		"version": version,
+		"id":          nodeID,
+		"name":        hostname,
+		"fqdn":        commonName,
+		"api_url":     "https://" + commonName + ":3443",
+		"version":     version,
+		"config_hash": configHash,
 	})
 
 	pair, err := tls.LoadX509KeyPair(tlsDir+"/peer.crt", tlsDir+"/peer.key")