feat: add Docker-based tool addons for dockge, komodo, dokploy, npmplus

Create addon scripts following the arcane.sh pattern for Docker-based
tools that can be installed on any existing Docker LXC:

- dockge: Docker Compose stack manager (port 5001)
- komodo: Build/deployment system with MongoDB/FerretDB (port 9120)
- dokploy: PaaS via external installer with Redis (port 3000)
- npmplus: Nginx Proxy Manager Plus via Compose (port 81)

Each addon includes:
- Docker availability check
- Install with full configuration
- Update via docker compose pull
- Uninstall with container cleanup
- ASCII header files

Original ct/ and install/ scripts are preserved for now.

tools/headers/npmplus

@@ -0,0 +1,6 @@
+    _   ______  __  ___       __           
+   / | / / __ \/  |/  /____  / /_  _______ 
+  /  |/ / /_/ / /|_/ / __ \/ / / / / ___/ 
+ / /|  / ____/ /  / / /_/ / / /_/ (__  )  
+/_/ |_/_/   /_/  /_/ .___/_/\__,_/____/   
+                  /_/