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/myspeed.json

@@ -0,0 +1,35 @@
+{
+  "name": "MySpeed",
+  "slug": "myspeed",
+  "categories": [
+    4
+  ],
+  "date_created": "2024-06-14",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": 5216,
+  "documentation": "https://docs.myspeed.dev/",
+  "website": "https://myspeed.dev/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/myspeed.webp",
+  "config_path": "",
+  "description": "MySpeed is a speed test analysis tool that records and displays internet speed metrics for up to 30 days. It offers automated tests using Cron expressions and supports multiple speed test servers (Ookla, LibreSpeed, Cloudflare). MySpeed provides detailed statistics, health check notifications via email or messaging apps, and integrates with Prometheus and Grafana for advanced monitoring.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/myspeed.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 1024,
+        "hdd": 4,
+        "os": "debian",
+        "version": "13"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": []
+}