v0.41.2: fix controller-route auto-connect + dead dashboard cross-drive block

containerOnNetwork misread the absent-key '<nil>' as "already attached", so
wireController skipped docker network connect -> traefik 502'd felhom.<domain>.
Now lists network names and matches exactly. Also removed dashboard.html's dead
CrossDrive* block (slice-8C leftover) that 500'd the dashboard via gt <nil> 0,
exposed once v0.41.1 made the dashboard reachable.

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

controller/internal/web/templates/dashboard.html

@@ -127,24 +127,9 @@
         <span class="backup-value">{{len .DBDumpStatus.Results}} mentve</span>
     </div>
     {{end}}
-    {{if gt .CrossDriveTotal 0}}
-    <div class="backup-info-row">
-        <span class="backup-label">2. mentés:</span>
-        <span class="backup-value">
-            {{if eq .CrossDriveConfigured 0}}
-                <span style="color:var(--yellow)">⚠ Nincs beállítva</span>
-            {{else}}
-                <span class="{{if gt .CrossDriveFailed 0}}backup-status-fail{{else}}backup-status-ok{{end}}">{{.CrossDriveConfigured}} / {{.CrossDriveTotal}} alk.</span>
-            {{end}}
-        </span>
-    </div>
-    {{end}}
-    {{if gt .CrossDriveFailed 0}}
-    <div class="backup-info-row">
-        <span class="backup-label" style="color:var(--red)">Figyelmeztetés:</span>
-        <span class="backup-value backup-status-fail">⚠ {{.CrossDriveFailed}} 2. mentés sikertelen</span>
-    </div>
-    {{end}}
+    {{/* Cross-drive ("2. mentés") moved to the host agent in slice 8C — the dashboard handler no
+         longer provides CrossDrive* fields, so the old block was a dead reference that 500'd the
+         dashboard (gt <nil> 0). Removed in v0.41.2. */}}
 </div>
 {{end}}