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/cleanuparr.json

@@ -0,0 +1,35 @@
+{
+  "name": "Cleanuparr",
+  "slug": "cleanuparr",
+  "categories": [
+    14
+  ],
+  "date_created": "2025-07-25",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": 11011,
+  "documentation": "https://cleanuparr.github.io/Cleanuparr/docs/",
+  "website": "https://github.com/Cleanuparr/Cleanuparr",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/cleanuparr.webp",
+  "config_path": "/opt/cleanuparr/config",
+  "description": "Cleanuparr is a tool for automating the cleanup of unwanted or blocked files in Sonarr, Radarr, and supported download clients like qBittorrent, Transmission, and Deluge. It removes incomplete, blocked, or malicious downloads and can trigger replacement searches to ensure your media library stays complete and up-to-date.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/cleanuparr.sh",
+      "resources": {
+        "cpu": 2,
+        "ram": 1024,
+        "hdd": 4,
+        "os": "debian",
+        "version": "13"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": []
+}