feat: install.sh One-Liner-Bootstrap + System-Adressen-Card auf IP-Page

scripts/install.sh: full curl-Onliner für Debian 13 trixie analog
mail-gateway/scripts/install.sh — OS+Arch-Detection, Pre-flight-
Tools, GPG-Key (nmg.asc, geteilt mit mail-gateway), APT-Source-Line
trixie main, apt install edgeguard, Service-Smoke + healthz-Probe.
Bestimmungsort: get.netcell-edgeguard.de (Hosting separat).

UI: IP-Adressen-Page bekommt eine "Adressen am Kernel"-Card oben,
analog zur Networks-Page. Listet jede vom Kernel sichtbare IP
(lo + eth0 + …) mit Family-Tag (IPv4/IPv6) — read-only. Verwaltete
Adressen darunter wie zuvor. User-Feedback: "die bestehenden
IP-Adressen werden nicht angezeigt" — adressiert.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

management-ui/src/i18n/locales/de/common.json

@@ -42,7 +42,10 @@
   },
   "ips": {
     "title": "IP-Adressen",
-    "intro": "Adressen, die EdgeGuard verwaltet — inklusive VIPs für Cluster-Failover. Bindung an die deklarierten Interfaces oben.",
+    "intro": "Adressen, die das Betriebssystem zeigt (Read-only oben) plus die Adressen, die EdgeGuard zusätzlich verwaltet — inklusive VIPs für Cluster-Failover.",
+    "systemDiscovered": "Adressen am Kernel (read-only)",
+    "managedTitle": "Verwaltete Adressen",
+    "family": "Familie",
     "addAddress": "Adresse hinzufügen",
     "editAddress": "Adresse bearbeiten",
     "interface": "Interface",

management-ui/src/i18n/locales/en/common.json

@@ -42,7 +42,10 @@
   },
   "ips": {
     "title": "IP addresses",
-    "intro": "Addresses managed by EdgeGuard — including VIPs that follow the active cluster node on failover.",
+    "intro": "Addresses the kernel currently has (read-only above) plus addresses EdgeGuard additionally manages — including VIPs that follow the active cluster node on failover.",
+    "systemDiscovered": "Kernel addresses (read-only)",
+    "managedTitle": "Managed addresses",
+    "family": "Family",
     "addAddress": "Add address",
     "editAddress": "Edit address",
     "interface": "Interface",