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/clean-orphaned-lvm.json

@@ -0,0 +1,40 @@
+{
+  "name": "PVE Clean Orphaned LVM",
+  "slug": "clean-orphaned-lvm",
+  "categories": [
+    1
+  ],
+  "date_created": "2025-01-29",
+  "type": "pve",
+  "updateable": false,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": null,
+  "website": null,
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/proxmox.webp",
+  "config_path": "",
+  "description": "This script helps Proxmox users identify and remove orphaned LVM volumes that are no longer associated with any VM or LXC container. It scans all LVM volumes, detects unused ones, and provides an interactive prompt to delete them safely. System-critical volumes like root, swap, and data are excluded to prevent accidental deletion.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "tools/pve/clean-orphaned-lvm.sh",
+      "resources": {
+        "cpu": null,
+        "ram": null,
+        "hdd": null,
+        "os": null,
+        "version": null
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "Execute within the Proxmox shell",
+      "type": "info"
+    }
+  ]
+}