R-66: the box's own address becomes visible (v0.159.0)

Leg A: „Hálózat" card on Beállítások → Rendszer — Helyi cím (LAN),
Hálózati név (only while Megosztás is enabled), Átjáró; live per render,
stored nowhere (S-5), „—" on unavailable.
Leg B: network section in the Debug system dump (interfaces/route/DNS/
lan_address), best-effort per item via the samba-netns door.
Leg C: NetBIOS trap named — Szerver field helper text + a purely lexical
hint on unreachable failures for single-label non-IP names.

Design note: all guest-net reads go through docker exec into the
host-networked felhom-samba container (stacks/guestnet.go, one seam) —
the controller's own netns is the docker bridge, so /proc/net/route etc.
would answer 172.x (the S-2 trap). Red-proofs: A2 gate-drop and C2
lexical-invert both failed as required.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UuFPHmHNrCJj1VhY6QdDMU

controller/internal/web/templates/settings_system.html

@@ -143,6 +143,30 @@
     </div>
 </div>
 
+<!-- Section: Network (R-66) — the box's own address. Every value is live-computed per render and
+     stored NOWHERE (S-5: a DHCP lease persisted anywhere eventually misdirects people); a missing
+     value renders „—" because an address-less row beats a wrong address. -->
+<div class="settings-card">
+    <h3>Hálózat</h3>
+    <div class="settings-grid">
+        <div class="settings-row">
+            <span class="settings-label">Helyi cím (LAN)</span>
+            <span class="settings-value mono">{{if .NetLANAddress}}{{.NetLANAddress}}{{else}}— <span style="color:var(--text-3);">nem állapítható meg</span>{{end}}</span>
+        </div>
+        {{if .NetSMBName}}
+        <div class="settings-row">
+            <span class="settings-label">Hálózati név</span>
+            <span class="settings-value mono">\\{{.NetSMBName}}</span>
+        </div>
+        {{end}}
+        <div class="settings-row">
+            <span class="settings-label">Átjáró</span>
+            <span class="settings-value mono">{{if .NetGateway}}{{.NetGateway}}{{else}}— <span style="color:var(--text-3);">nem állapítható meg</span>{{end}}</span>
+        </div>
+    </div>
+    <p class="settings-card-desc" style="margin-top:0.5em;">Ezek az értékek a helyi hálózattól függenek és változhatnak. Távoli hibaelhárításnál ezt az oldalt kérjük felolvasni.</p>
+</div>
+
 <div class="settings-card">
     <h3>Szerver memória (RAM)</h3>
     {{if .MemorySupported}}