Add Neko virtual browser template

Introduce Neko container template with installer and metadata. Adds ct/neko.sh (container install entrypoint and update routine), install/neko-install.sh (detailed install/build steps: fetch GitHub release m1k1o/neko, build client/server, configure supervisord, systemd service, runtime users, plugins, and default neko.yaml), and json/neko.json (app metadata, resources, port 8080, default credentials and notes). Enables automated provisioning of the Neko WebRTC virtual browser on Debian 12 with default CPU/RAM/disk values.

json/neko.json

@@ -0,0 +1,44 @@
+{
+    "name": "Neko",
+    "slug": "neko",
+    "categories": [
+        13
+    ],
+    "date_created": "2026-04-13",
+    "type": "ct",
+    "updateable": true,
+    "privileged": false,
+    "interface_port": 8080,
+    "documentation": "https://neko.m1k1o.net/docs/v3/configuration",
+    "website": "https://neko.m1k1o.net/",
+    "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/neko.webp",
+    "config_path": "/etc/neko/neko.yaml",
+    "description": "A self-hosted virtual browser that uses WebRTC to stream a desktop environment to multiple users for watch parties, collaborative browsing, and interactive presentations.",
+    "install_methods": [
+        {
+            "type": "default",
+            "script": "ct/neko.sh",
+            "resources": {
+                "cpu": 4,
+                "ram": 4096,
+                "hdd": 12,
+                "os": "Debian",
+                "version": "12"
+            }
+        }
+    ],
+    "default_credentials": {
+        "username": "admin",
+        "password": "admin"
+    },
+    "notes": [
+        {
+            "text": "Regular user password is 'neko'. Change both passwords in /etc/neko/neko.yaml after first login.",
+            "type": "warning"
+        },
+        {
+            "text": "Firefox ESR is installed as the default browser. The virtual display runs at 1280x720.",
+            "type": "info"
+        }
+    ]
+}