feat(T02-T11): IHF Phase 1 schema, controllers, views, and helpers

- Schema: hubs, widgets, widget_versions, interaction_events (append-only
  trigger), annotations, users — single migration file
- Web layer: Types, Routes, FrontController with auth + AutoRefresh layout
- Controllers: Hubs (CRUD), Widgets (CRUD + versioning), InteractionEvents
  (JSON capture, canonical event_type validation), Annotations (threaded,
  append-only)
- Sessions controller for IHP auth
- Views: Hubs (index/show/new/edit), Widgets (index/show/new/edit),
  Annotations (index/new), Sessions (login)
- widgetEnvelope helper with full data-* governance attributes
- Integration tests: Hub CRUD, Widget versioning, event capture, append-only
  guard, annotation threading, validation

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Web/Routes.hs

@@ -0,0 +1,20 @@
+module Web.Routes where
+
+import IHP.RouterPrelude
+import Generated.Types
+import Web.Types
+
+-- Hubs
+instance AutoRoute HubsController
+
+-- Widgets
+instance AutoRoute WidgetsController
+
+-- Interaction Events  (POST /widgets/:widgetId/events)
+instance AutoRoute InteractionEventsController
+
+-- Annotations (scoped to widget: /widgets/:widgetId/annotations/)
+instance AutoRoute AnnotationsController
+
+-- Sessions
+instance AutoRoute SessionsController