Add ddclient LXC container

frontend/public/json/ddclient.json

@@ -0,0 +1,48 @@
+{
+  "name": "ddclient",
+  "slug": "ddclient",
+  "categories": [
+    4
+  ],
+  "date_created": "2026-01-31",
+  "type": "ct",
+  "updateable": true,
+  "privileged": false,
+  "interface_port": null,
+  "documentation": "https://ddclient.net/",
+  "website": "https://ddclient.net/",
+  "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/ddclient.webp",
+  "config_path": "/etc/ddclient.conf",
+  "description": "ddclient is a Perl client used to update dynamic DNS entries for accounts on a wide range of dynamic DNS service providers. It supports multiple protocols and providers, allowing automatic IP address updates for your domain names.",
+  "install_methods": [
+    {
+      "type": "default",
+      "script": "ct/ddclient.sh",
+      "resources": {
+        "cpu": 1,
+        "ram": 512,
+        "hdd": 2,
+        "os": "debian",
+        "version": "13"
+      }
+    }
+  ],
+  "default_credentials": {
+    "username": null,
+    "password": null
+  },
+  "notes": [
+    {
+      "type": "info",
+      "text": "After installation, edit `/etc/ddclient.conf` with your dynamic DNS provider credentials"
+    },
+    {
+      "type": "info",
+      "text": "Sample configuration is created for Namecheap but can be modified for other providers"
+    },
+    {
+      "type": "info",
+      "text": "The configuration file is set to chmod 600 for security"
+    }
+  ]
+}