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/handler_debug.go

@@ -214,6 +214,42 @@ func (s *Server) debugDump(w http.ResponseWriter, r *http.Request) {
 		dump["backup"] = map[string]interface{}{"enabled": false}
 	}
 
+	// Network (R-66) — the guest's netns view, read through the samba-container door
+	// (stacks/guestnet.go: the controller's OWN netns is the docker bridge — the S-2 wrong
+	// answer). Best-effort per item, the dump's tolerance style: a failed read yields that
+	// item's error string in place and never aborts the dump. lan_address is the SAME live
+	// value the Hálózat card shows, so a support session can cross-check the two.
+	netSnap := s.guestNetSnapshot()
+	network := map[string]interface{}{}
+	if e := netSnap.Errors["interfaces"]; e != "" {
+		network["interfaces"] = "error: " + e
+	} else {
+		ifaces := make([]map[string]interface{}, 0, len(netSnap.Interfaces))
+		for _, gi := range netSnap.Interfaces {
+			ifaces = append(ifaces, map[string]interface{}{
+				"name":      gi.Name,
+				"up":        gi.Up,
+				"addresses": gi.Addresses,
+			})
+		}
+		network["interfaces"] = ifaces
+	}
+	if e := netSnap.Errors["route"]; e != "" {
+		network["default_route"] = "error: " + e
+	} else {
+		network["default_route"] = map[string]interface{}{
+			"gateway":   netSnap.Gateway,
+			"interface": netSnap.RouteInterface,
+		}
+	}
+	if e := netSnap.Errors["dns"]; e != "" {
+		network["dns_servers"] = "error: " + e
+	} else {
+		network["dns_servers"] = netSnap.DNSServers
+	}
+	network["lan_address"] = netSnap.LANAddress
+	dump["network"] = network
+
 	// Hub
 	hubInfo := map[string]interface{}{
 		"url":     s.cfg.Hub.URL,