Feature Policies API + Invitations Policies (#375)

- Added Feature Policy API: a declarative system to enable/disable/modify default behavior in the SaaS kit
- Team invitation policies with pre-checks using the Feature Policy API: Invite Members dialog now shows loading, errors, and clear reasons when invitations are blocked
- Version bump to 2.16.0 and widespread dependency updates (Supabase, React types, react-i18next, etc.).
- Added comprehensive docs for the new policy system and orchestrators.
- Subscription cancellations now trigger immediate invoicing explicitly

packages/monitoring/core/package.json

@@ -17,7 +17,7 @@
     "@kit/eslint-config": "workspace:*",
     "@kit/prettier-config": "workspace:*",
     "@kit/tsconfig": "workspace:*",
-    "@types/react": "19.1.13",
+    "@types/react": "19.1.15",
     "react": "19.1.1"
   },
   "typesVersions": {