Delete checkmate (ct) after migration to ProxmoxVE (#1431)

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

frontend/public/json/checkmate.json

@@ -1,48 +0,0 @@
-{
-    "name": "Checkmate",
-    "slug": "checkmate",
-    "categories": [
-        9
-    ],
-    "date_created": "2026-02-02",
-    "type": "ct",
-    "updateable": true,
-    "privileged": false,
-    "interface_port": 5173,
-    "documentation": "https://github.com/bluewave-labs/Checkmate#readme",
-    "website": "https://github.com/bluewave-labs/Checkmate",
-    "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/checkmate.webp",
-    "config_path": "/opt/checkmate/server/.env",
-    "description": "Checkmate is an open source uptime and infrastructure monitoring application that helps you track the availability and performance of your services.",
-    "install_methods": [
-        {
-            "type": "default",
-            "script": "ct/checkmate.sh",
-            "resources": {
-                "cpu": 2,
-                "ram": 4096,
-                "hdd": 10,
-                "os": "Debian",
-                "version": "13"
-            }
-        }
-    ],
-    "default_credentials": {
-        "username": null,
-        "password": null
-    },
-    "notes": [
-        {
-            "text": "Create your admin account on first login via the web interface.",
-            "type": "info"
-        },
-        {
-            "text": "Server API runs on port 52345, Client UI on port 5173.",
-            "type": "info"
-        },
-        {
-            "text": "For PageSpeed monitoring, add a Google PageSpeed API key to the server .env file.",
-            "type": "info"
-        }
-    ]
-}