Add CT installers and metadata for six apps

Add container templates, install scripts and metadata for six applications: BirdNET-Go, ERPNext, Jitsi Meet, Storybook, Storyteller and Tube Archivist. New files include ct/* scripts (container templates and update handlers), install/* scripts (installation and systemd service setup, dependency installation and build steps) and json/* metadata entries (app catalog data, default resources, ports and notes). Each install script configures required dependencies, creates services, and prepares runtime configuration (e.g. DB, ElasticSearch, Node/Python environments, ffmpeg/Readium). This commit enables automated LXC provisioning and update flows for these apps.

json/erpnext.json

@@ -0,0 +1,48 @@
+{
+    "name": "ERPNext",
+    "slug": "erpnext",
+    "categories": [
+        25
+    ],
+    "date_created": "2026-03-25",
+    "type": "ct",
+    "updateable": true,
+    "privileged": false,
+    "interface_port": 8000,
+    "documentation": "https://docs.erpnext.com/",
+    "website": "https://erpnext.com/",
+    "logo": "https://cdn.jsdelivr.net/gh/selfhst/icons@main/webp/erpnext.webp",
+    "config_path": "/opt/frappe-bench/.env",
+    "description": "ERPNext is a powerful, intuitive and open-source ERP system for managing accounting, inventory, manufacturing, CRM, projects, HR and more.",
+    "install_methods": [
+        {
+            "type": "default",
+            "script": "ct/erpnext.sh",
+            "resources": {
+                "cpu": 4,
+                "ram": 4096,
+                "hdd": 20,
+                "os": "Debian",
+                "version": "13"
+            }
+        }
+    ],
+    "default_credentials": {
+        "username": "Administrator",
+        "password": null
+    },
+    "notes": [
+        {
+            "text": "Admin password is stored in `/opt/frappe-bench/.env`.",
+            "type": "info"
+        },
+        {
+            "text": "The default site name is `site1.local`. Configure your domain in Frappe settings.",
+            "type": "info"
+        },
+        {
+            "text": "Run `bench update` from `/opt/frappe-bench` to update ERPNext manually.",
+            "type": "info"
+        }
+    ]
+}