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/dockge

@@ -0,0 +1,6 @@
+    ____             __              
+   / __ \____  _____/ /______ ____  
+  / / / / __ \/ ___/ //_/ __ `/ _ \ 
+ / /_/ / /_/ / /__/ ,< / /_/ /  __/ 
+/_____/\____/\___/_/|_|\__, /\___/  
+                      /____/