feat(FN-3637): establish canonical roadmap plugin ID and compatibility rout

Merged commits stabilize the Fusion roadmap plugin's identity and routing surface, establishing a canonical plugin ID and compatibility routes so the roadmap plugin integrates cleanly with the dashboard's plugin system. Added new roadmap-routes and roadmap-suggestions modules in the dashboard packag

Fusion-Task-Id: FN-3637

plugins/fusion-plugin-roadmap/manifest.json

@@ -1,5 +1,5 @@
 {
-  "id": "roadmap-planner",
+  "id": "fusion-plugin-roadmap",
   "name": "Roadmaps",
   "version": "0.1.0",
   "description": "Standalone roadmap planning plugin",