Delete qbittorrent-exporter (addon) after migration to ProxmoxVE (#1221)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

frontend/public/json/qbittorrent-exporter.json

@@ -1,46 +0,0 @@
-{
-    "name": "qbittorrent Exporter",
-    "slug": "qbittorrent-exporter",
-    "categories": [
-        9
-    ],
-    "date_created": "2025-11-21",
-    "type": "addon",
-    "updateable": true,
-    "privileged": false,
-    "interface_port": 8090,
-    "documentation": "https://github.com/martabal/qbittorrent-exporter",
-    "website": "https://github.com/martabal/qbittorrent-exporter",
-    "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/qbittorrent.webp",
-    "config_path": "/opt/qbittorrent-exporter.env",
-    "description": "A fast and lightweight prometheus exporter for qBittorrent ",
-    "install_methods": [
-        {
-            "type": "default",
-            "script": "tools/addon/qbittorrent-exporter.sh",
-            "resources": {
-                "cpu": null,
-                "ram": null,
-                "hdd": null,
-                "os": null,
-                "version": null
-            }
-        },
-        {
-            "type": "alpine",
-            "script": "tools/addon/qbittorrent-exporter.sh",
-            "resources": {
-                "cpu": null,
-                "ram": null,
-                "hdd": null,
-                "os": null,
-                "version": null
-            }
-        }
-    ],
-    "default_credentials": {
-        "username": null,
-        "password": null
-    },
-    "notes": []
-}