feat: HA-Cluster v1.2.x — Split-Brain, TOTP, Enterprise-FW, Drift-Fix, VIP-Recovery

- keepalived: pg_role='standby' hat Vorrang vor role für BACKUP-Bestimmung
- keepalived-master.sh: gecrasht Dienste beim MASTER-Übergang starten (nicht nur reload)
- confighash: ip_addresses per Interface-Name hashen statt per FK (Cross-Node-Drift-Fix)
- TOTP/2FA: RFC 6238 — Setup-Flow, QR-Code, Admin-Disable; two-step Login
- Firewall-UI: Enterprise-Design — auto-Beschreibung, icon-only Actions, zero-hit Indikator
- fe80-Filter: Link-local IPv6 aus NTP/DNS Listen-Dropdowns entfernen
- VIP-Dashboard, Dual-Path VRRP, GW-Tracking (Migrations 0033/0034)
- Forward Proxy + DNS erweiterte Einstellungen (Migrations 0031/0032)
- unbound-control: edgeguard in unbound-Gruppe via postinst

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

internal/services/forwardproxy/forwardproxy.go

@@ -1,6 +1,6 @@
 // Package forwardproxy provides CRUD against the forward_proxy_acls
-// table. Renderer in internal/squid consumes the same rows to emit
-// /etc/edgeguard/squid/squid.conf.
+// table and settings in forward_proxy_settings. Renderer in internal/squid
+// consumes both tables to emit /etc/edgeguard/squid/squid.conf.
 package forwardproxy
 
 import (
@@ -97,6 +97,52 @@ func (r *Repo) Delete(ctx context.Context, id int64) error {
 	return nil
 }
 
+// Settings returns the singleton forward_proxy_settings row.
+func (r *Repo) GetSettings(ctx context.Context) (*models.ForwardProxySettings, error) {
+	var s models.ForwardProxySettings
+	if err := r.Pool.QueryRow(ctx, `
+SELECT id, listen_addresses, listen_port,
+       cache_mem_mb, cache_dir_mb, max_obj_size_mb,
+       connect_timeout, read_timeout, request_timeout,
+       created_at, updated_at
+FROM forward_proxy_settings WHERE id=1`).Scan(
+		&s.ID, &s.ListenAddresses, &s.ListenPort,
+		&s.CacheMemMB, &s.CacheDirMB, &s.MaxObjSizeMB,
+		&s.ConnectTimeout, &s.ReadTimeout, &s.RequestTimeout,
+		&s.CreatedAt, &s.UpdatedAt,
+	); err != nil {
+		return nil, err
+	}
+	return &s, nil
+}
+
+func (r *Repo) UpdateSettings(ctx context.Context, s models.ForwardProxySettings) (*models.ForwardProxySettings, error) {
+	var out models.ForwardProxySettings
+	if err := r.Pool.QueryRow(ctx, `
+UPDATE forward_proxy_settings SET
+   listen_addresses=$1, listen_port=$2,
+   cache_mem_mb=$3, cache_dir_mb=$4, max_obj_size_mb=$5,
+   connect_timeout=$6, read_timeout=$7, request_timeout=$8,
+   updated_at=NOW()
+WHERE id=1
+RETURNING id, listen_addresses, listen_port,
+          cache_mem_mb, cache_dir_mb, max_obj_size_mb,
+          connect_timeout, read_timeout, request_timeout,
+          created_at, updated_at`,
+		s.ListenAddresses, s.ListenPort,
+		s.CacheMemMB, s.CacheDirMB, s.MaxObjSizeMB,
+		s.ConnectTimeout, s.ReadTimeout, s.RequestTimeout,
+	).Scan(
+		&out.ID, &out.ListenAddresses, &out.ListenPort,
+		&out.CacheMemMB, &out.CacheDirMB, &out.MaxObjSizeMB,
+		&out.ConnectTimeout, &out.ReadTimeout, &out.RequestTimeout,
+		&out.CreatedAt, &out.UpdatedAt,
+	); err != nil {
+		return nil, err
+	}
+	return &out, nil
+}
+
 func scan(row interface{ Scan(...any) error }) (*models.ForwardProxyACL, error) {
 	var a models.ForwardProxyACL
 	if err := row.Scan(