refactor: remove frontend, move JSONs to json/ top-level

- Archive frontend to community-scripts/ProxmoxVE-Frontend-Archive
- Move frontend/public/json/ -> json/
- Update workflow paths in 5 actions:
  - update-versions-github.yml
  - update-json-date.yml
  - push-json-to-pocketbase.yml
  - delete-pocketbase-entry-on-removal.yml
  - autolabeler.yml
- Remove frontend-cicd.yml (no longer needed)
- Clean up .gitignore (remove frontend-specific entries)

json/debian-13-vm.json

@@ -0,0 +1,48 @@
+{
+  "name": "Debian 13",
+  "slug": "debian-13-vm",
+  "categories": [
+    2
+  ],
+  "date_created": "2025-08-19",
+  "type": "vm",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": null,
+  "website": "https://www.debian.org/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/debian.webp",
+  "config_path": "",
+  "description": "Debian 13 (Trixie) Linux is a distribution that emphasizes free software. It supports many hardware platforms",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "vm/debian-13-vm.sh",
+      "resources": {
+        "cpu": 2,
+        "ram": 2048,
+        "hdd": 4,
+        "os": null,
+        "version": null
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "VM has no root password set. To login type in user `root` and just press enter",
+      "type": "info"
+    },
+    {
+      "text": "For additional Debian commands and tips after installation, checkout: `https://github.com/community-scripts/ProxmoxVE/discussions/836`",  
+      "type": "info"
+    },
+    {
+      "text": "If you use Cloud-init, checkout cloud-init discussion: `https://github.com/community-scripts/ProxmoxVE/discussions/272`",
+      "type": "info"
+    }
+  ]
+}