feat(FN-3159): move roadmap ownership from core to fusion-plugin-roadmap pl

Moves roadmap ownership from `@fusion/core` to `fusion-plugin-roadmap`, deleting ~1,800 lines of roadmap store, types, ordering, and handoff logic from core and replacing it with ~760 lines of new route handlers in the plugin. The dashboard's roadmap routes and suggestions modules are substantially

Fusion-Task-Id: FN-3159

pnpm-lock.yaml

@@ -214,6 +214,9 @@ importers:
       '@fusion-plugin-examples/paperclip-runtime':
         specifier: workspace:*
         version: link:../../plugins/fusion-plugin-paperclip-runtime
+      '@fusion-plugin-examples/roadmap':
+        specifier: workspace:*
+        version: link:../../plugins/fusion-plugin-roadmap
       '@fusion/core':
         specifier: workspace:*
         version: link:../core
@@ -768,6 +771,9 @@ importers:
         specifier: ^5.1.0
         version: 5.2.1
     devDependencies:
+      '@types/express':
+        specifier: ^5.0.5
+        version: 5.0.6
       '@types/node':
         specifier: ^25.5.2
         version: 25.5.2