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/pve-privilege-converter.json

@@ -0,0 +1,48 @@
+{
+  "name": "PVE Privilege Converter",
+  "slug": "pve-privilege-converter",
+  "categories": [
+    1
+  ],
+  "date_created": "2025-06-02",
+  "type": "pve",
+  "updateable": false,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": "https://github.com/onethree7/proxmox-lxc-privilege-converter",
+  "website": null,
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/proxmox.webp",
+  "config_path": "",
+  "description": "This script allows converting Proxmox LXC containers between privileged and unprivileged modes using vzdump backup and restore. It guides you through container selection, backup storage, ID assignment, and privilege flipping via automated restore. Useful for applying changes that require different LXC modes.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "tools/pve/pve-privilege-converter.sh",
+      "resources": {
+        "cpu": null,
+        "ram": null,
+        "hdd": null,
+        "os": null,
+        "version": null
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "Execute this script inside the Proxmox shell as root.",
+      "type": "info"
+    },
+    {
+      "text": "Ensure that the backup and target storage have enough space.",
+      "type": "warning"
+    },
+    {
+      "text": "The container will be recreated with a new ID and desired privilege setting.",
+      "type": "info"
+    }
+  ]
+}