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/salt.json

@@ -0,0 +1,35 @@
+{
+  "name": "Salt",
+  "slug": "salt",
+  "categories": [
+    19
+  ],
+  "date_created": "2025-07-22",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "config_path": "/opt/salt/.env",
+  "interface_port": null,
+  "documentation": "https://docs.saltproject.io/salt/install-guide/en/latest/",
+  "website": "https://saltproject.io/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/salt.webp",
+  "description": "SaltStack Salt is a software for automating the management and configuration of IT infrastructure and applications. It is an event-driven automation tool and framework used to deploy, configure, and manage complex IT systems. Its primary functions include configuration management, where it ensures consistent configurations and manages operating system deployment and software installation. It also automates and orchestrates routine IT processes and can create self-aware, self-healing systems.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/salt.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 1024,
+        "hdd": 3,
+        "os": "Debian",
+        "version": "13"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": []
+}