feat(FN-3778): add reports plugin scaffold with notification service improv

The merge introduces a new `fusion-plugin-reports` plugin scaffold with settings schema, manifest, entry point, and tests, alongside a mobile session switcher in the chat header. It also adds a mailbox notifications system with ntfy/webhook providers, cleans up roadmap types from core, and includes

Fusion-Task-Id: FN-3778

plugins/fusion-plugin-reports/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "dist",
+    "rootDir": "src",
+    "types": ["node", "vitest/globals"]
+  },
+  "include": ["src/**/*"]
+}