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/2fauth.json

@@ -0,0 +1,44 @@
+{
+  "name": "2FAuth",
+  "slug": "2fauth",
+  "categories": [
+    6
+  ],
+  "date_created": "2024-12-20",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": 80,
+  "documentation": "https://docs.2fauth.app/",
+  "website": "https://2fauth.app/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/2fauth.webp",
+  "config_path": "cat /opt/2fauth/.env",
+  "description": "2FAuth is a web based self-hosted alternative to One Time Passcode (OTP) generators like Google Authenticator, designed for both mobile and desktop. It aims to ease you perform your 2FA authentication steps whatever the device you handle, with a clean and suitable interface.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/2fauth.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 512,
+        "hdd": 2,
+        "os": "debian",
+        "version": "13"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "Database credentials: `cat ~/2FAuth.creds`",
+      "type": "info"
+    },
+    {
+      "text": "The very first account created is automatically set up as an administrator account.",
+      "type": "info"
+    }
+  ]
+}