Add install and setup scripts for multiple Linux distros

Introduces container setup scripts and install scripts for AlmaLinux, CentOS Stream, Devuan, Fedora, Gentoo, openEuler, openSUSE, Rocky Linux, and updates Alpine install script. Adds corresponding JSON metadata files for each distribution in the frontend. These changes enable streamlined LXC container creation and installation for a wide range of Linux distributions.

frontend/public/json/devuan.json

@@ -0,0 +1,38 @@
+{
+  "name": "Devuan",
+  "slug": "devuan",
+  "categories": [0],
+  "date_created": "2025-12-04",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": "https://www.devuan.org/os/documentation",
+  "website": "https://www.devuan.org/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons/webp/devuan.webp",
+  "config_path": "",
+  "description": "Devuan is a fork of Debian without systemd. It uses sysvinit and other alternative init systems, providing freedom of choice.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/devuan.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 512,
+        "hdd": 4,
+        "os": "devuan",
+        "version": "5.0"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": "root",
+    "password": null
+  },
+  "notes": [
+    {
+      "text": "Devuan uses sysvinit instead of systemd.",
+      "type": "info"
+    }
+  ]
+}