fix(ift): mount ObserverWeb dashboard at / on dedicated host

observer.ift.calentiq.com already has its own subdomain; /observer path prefix is redundant.

docker/observer_web/dev.exs

@@ -12,7 +12,8 @@ defmodule WebDev.Router do
   scope "/" do
     pipe_through(:browser)
 
-    observer_dashboard("/observer")
+    # Dedicated host observer.*.calentiq.com — mount at root (no /observer prefix)
+    observer_dashboard("/")
   end
 end