refactor: convert Docker tools to addons, remove old scripts

Convert dockge, komodo, dokploy, coolify from standalone ct/install
scripts to addon pattern (like arcane.sh).

Added:
- tools/addon/dockge.sh (port 5001)
- tools/addon/komodo.sh (port 9120, MongoDB/FerretDB choice)
- tools/addon/dokploy.sh (port 3000, external installer)
- tools/addon/coolify.sh (port 8000, external installer)
- tools/headers/ for all 4

Removed:
- ct/dockge.sh, ct/komodo.sh, ct/alpine-komodo.sh, ct/dokploy.sh, ct/coolify.sh
- install/dockge-install.sh, install/komodo-install.sh, install/alpine-komodo-install.sh
- install/dokploy-install.sh, install/coolify-install.sh
- frontend/public/json/ for dockge, komodo, dokploy, coolify
- tools/addon/npmplus.sh (not an addon candidate)

These tools are Docker-only and fit the addon pattern: they require
an existing Docker LXC and manage containers via docker compose.

tools/headers/coolify

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

tools/headers/npmplus

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