feat(260924-i8v): Titel und Serverauswahl der Proxmox-Kachel an der Kachel und in den Einstellungen

- ProxmoxServerPicker gemeinsam fuer Kachel und Einstellungsformular
- Bearbeitungsmodus: entprelltes Titelfeld, Server auswaehlen statt Liste, sofort gespeichert
- ProxmoxWidgetConfigForm unter Einstellungen > Dashboard, Titel-Zusatz in der Kopfzeile

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

apps/web/src/messages/en.json

@@ -428,7 +428,12 @@
       "load": "Load {percent}",
       "backupAgo": "Backup {age}",
       "mailIn": "{count} incoming",
-      "selectionGone": "The selected servers no longer exist. Choose others in edit mode."
+      "selectionGone": "The selected servers no longer exist. Choose others in edit mode.",
+      "titleLabel": "Title",
+      "titlePlaceholder": "Title (optional)",
+      "serversLabel": "Servers shown",
+      "serversHint": "With nothing selected, the tile shows all servers.",
+      "chooseServers": "Choose servers"
     }
   },
   "admin": {