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>

Main.hs

@@ -6,9 +6,13 @@ import qualified IHP.Server
 import IHP.RouterSupport
 import IHP.FrameworkConfig
 import IHP.Job.Types
+import Web.FrontController
+import Web.Types
 
 instance FrontController RootApplication where
-    controllers = []
+    controllers =
+        [ mountFrontController WebApplication
+        ]
 
 instance Worker RootApplication where
     workers _ = []