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/mysql.json.bak

@@ -0,0 +1,48 @@
+{
+  "name": "MySQL",
+  "slug": "mysql",
+  "categories": [
+    8
+  ],
+  "date_created": "2024-10-10",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": "https://dev.mysql.com/doc/",
+  "website": "https://www.mysql.com/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/mysql.webp",
+  "config_path": "",
+  "description": "MySQL is an open-source relational database management system (RDBMS) that uses SQL for managing and manipulating data. It is known for its scalability, reliability, and high performance, making it suitable for small to large-scale applications. Key features include support for ACID transactions, data replication for high availability, and compatibility with various programming languages like Python, PHP, and Java.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/mysql.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 1024,
+        "hdd": 4,
+        "os": "debian",
+        "version": "12"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "Database credentials: `cat mysql.creds`",
+      "type": "info"
+    },
+    {
+      "text": "With an option to install the MySQL 8.4 LTS release instead of MySQL 8.0",
+      "type": "info"
+    },
+    {
+      "text": "If installed, access phpMyAdmin at `http://<LXC_IP>/phpMyAdmin`, case sensitive.",
+      "type": "info"
+    }
+  ]
+}