feat(dhcp): DHCPv4-Server via Kea (kea-dhcp4-server) — v1.2.92

Verwalteter DHCPv4-Server analog Unbound/Squid/Chrony.
- Migration 0041: dhcp_settings (singleton, node-lokal), dhcp_subnets, dhcp_reservations.
- internal/kea: Renderer baut Kea-JSON via Go-Struct→Marshal (garantiert valide), managed /etc/edgeguard/kea/kea-dhcp4.conf (Symlink von /etc/kea), Service-Lifecycle an enabled gekoppelt (default AUS, kein rogue DHCP). Interface per NAME (cluster-sicher, kein node-lokaler FK).
- internal/services/dhcp + internal/handlers/dhcp.go: Settings + Subnet/Reservation-CRUD, Validierung (CIDR/IP/MAC/interface exists).
- configgen: Stop/Enable/DisableService. Firewall: AutoFWRule.Iface → udp/67 pro LAN-Interface gescopt (kein WAN). Cluster: subnets/reservations repliziert (hashSpec), dhcp_settings node-lokal (localOnlyTables).
- main.go + render.go + WithAllReloaders Wiring. Packaging: kea-dhcp4-server Dependency, /etc/edgeguard/kea Dir, Symlink, disable-on-install, sudoers (restart/stop/enable/disable).
- UI: DHCP-Seite (Settings + Subnets + Reservierungen pro Subnet), Route/Nav/i18n de/en, HA-Warnung 'nur auf einer Node aktivieren'.
- Tests (guarded EG_FWTEST_DSN): Kea-Renderer gegen DB (valides JSON + Felder), FW-Auto-Rule-Iface inkl. nft -c. Scope v1: DHCPv4.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

management-ui/src/App.tsx

@@ -27,6 +27,7 @@ const FirewallPage = lazy(() => import('./pages/Firewall'))
 const WireguardPage = lazy(() => import('./pages/Wireguard'))
 const ForwardProxyPage = lazy(() => import('./pages/ForwardProxy'))
 const DNSPage = lazy(() => import('./pages/DNS'))
+const DHCPPage = lazy(() => import('./pages/DHCP'))
 const NTPPage = lazy(() => import('./pages/NTP'))
 const ClusterPage = lazy(() => import('./pages/Cluster'))
 const FirewallLivePage = lazy(() => import('./pages/FirewallLive'))
@@ -161,6 +162,7 @@ export default function App() {
                 <Route path="/vpn/wireguard" element={<WireguardPage />} />
                 <Route path="/forward-proxy" element={<ForwardProxyPage />} />
                 <Route path="/dns" element={<DNSPage />} />
+                <Route path="/dhcp" element={<DHCPPage />} />
                 <Route path="/ntp" element={<NTPPage />} />
                   <Route path="/cluster" element={<ClusterPage />} />
                   <Route path="/logs" element={<LogsPage />} />