Remove Unifi Network Server scripts (dead APT repo) (#12500)

* Initial plan

* remove Unifi (not unifi-os-server) CT, install, JSON, and header files

Co-authored-by: MickLesk <47820557+MickLesk@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: MickLesk <47820557+MickLesk@users.noreply.github.com>

frontend/public/json/unifi.json

@@ -1,42 +0,0 @@
-{
-  "name": "UniFi Network Server",
-  "slug": "unifi",
-  "categories": [
-    4
-  ],
-  "date_created": "2024-05-02",
-  "type": "ct",
-  "updateable": true,
-  "privileged": false,
-  "interface_port": 8443,
-  "documentation": "https://help.ui.com/hc/en-us/articles/360012282453-Self-Hosting-a-UniFi-Network-Server",
-  "website": "https://www.ui.com/",
-  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/ubiquiti-unifi.webp",
-  "config_path": "",
-  "description": "UniFi Network Server is a software that helps manage and monitor UniFi networks (Wi-Fi, Ethernet, etc.) by providing an intuitive user interface and advanced features. It allows network administrators to configure, monitor, and upgrade network devices, as well as view network statistics, client devices, and historical events. The aim of the application is to make the management of UniFi networks easier and more efficient.",
-  "disable": true,
-  "disable_description": "This script is disabled because UniFi no longer delivers APT packages for Debian systems. The installation relies on APT repositories that are no longer maintained or available. For more details, see: https://github.com/community-scripts/ProxmoxVE/issues/11876",
-  "install_methods": [
-    {
-      "type": "default",
-      "script": "ct/unifi.sh",
-      "resources": {
-        "cpu": 2,
-        "ram": 2048,
-        "hdd": 8,
-        "os": "debian",
-        "version": "12"
-      }
-    }
-  ],
-  "default_credentials": {
-    "username": null,
-    "password": null
-  },
-  "notes": [
-    {
-      "text": "For non-AVX CPUs, MongoDB 4.4 is installed. Please note this is a legacy solution that may present security risks and could become unsupported in future updates.",
-      "type": "warning"
-    }
-  ]
-}