fix(WP-0014): pre-flight compilation fixes, Tailwind pipeline, and admin seed

A2 — Compilation fixes:
- Remove inline FK constraints from Schema.sql; IHP schema compiler cannot
  parse them. Add 1744329600-restore-fk-constraints.sql migration to restore
  referential integrity at the DB level.
- Rename `#label` → `#label_` throughout to avoid clash with Haskell built-in.
- Fix `hub.id == hid` UUID comparisons to use `toUUID hub.id`.
- Replace non-existent `setStatus`/`respondJson` calls with
  `renderJsonWithStatusCode` throughout Api controllers.
- Fix qualified package import for `cryptohash-sha256` in Auth.hs.
- Add `CanSelect (Text, Text)` instance in Helper.View.
- Refactor HSX inline lambdas to named helper functions in 100+ views
  (GHC cannot infer types for anonymous functions inside quasi-quoted HSX).
- Fix missing imports (IHP.QueryBuilder, IHP.Fetch, Web.Routes, Only, etc.)
  across helpers and controllers.
- Remove duplicate `diffUTCTime` definition in BottleneckDetector.
- Change `createEventForHub` return type from `IO ResponseReceived` to `IO ()`.
- Seed type-registry vocabulary via 1744502400-seed-type-registries.sql
  (moved from Schema.sql where IHP does not execute INSERT statements).

A3 — Tailwind build pipeline:
- Add `tailwindcss` to flake.nix native packages.
- Uncomment `tailwind.exec` process in devenv shell config.
- Add tailwind/tailwind.config.js (scans Web/View/**/*.hs).
- Add tailwind/app.css with @tailwind directives.

A4 — Admin user seed:
- Add 1744416000-seed-admin-user.sql: inserts admin@inter-hub.local
  with bcrypt-hashed password admin1234! (cost 10).
- Add .env.example documenting all required environment variables
  and default admin credentials.

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

Web/View/Annotations/Index.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 data IndexView = IndexView
     { widget      :: !Widget
@@ -11,18 +12,21 @@ data IndexView = IndexView
     }
 
 instance View IndexView where
-    html IndexView { .. } = [hsx|
+    html IndexView { .. } =
+        let rootAnnotations = filter (\a -> isNothing a.parentId) annotations
+            childrenOf parent = filter (\a -> a.parentId == Just parent.id) annotations
+        in [hsx|
         <div class="mb-6 flex items-center gap-2 text-sm text-gray-500">
             <a href={WidgetsAction} class="hover:text-gray-700">Widgets</a>
             <span>/</span>
-            <a href={ShowWidgetAction { widgetId = widget.id }} class="hover:text-gray-700">{widget.name}</a>
+            <a href={ShowWidgetAction (widget.id)} class="hover:text-gray-700">{widget.name}</a>
             <span>/</span>
             <span>Annotations</span>
         </div>
 
         <div class="flex items-center justify-between mb-4">
             <h1 class="text-2xl font-semibold">Annotations for {widget.name}</h1>
-            <a href={NewAnnotationAction { widgetId = widget.id }}
+            <a href={NewAnnotationAction (widget.id)}
                class="bg-indigo-600 text-white text-sm font-medium px-4 py-2 rounded hover:bg-indigo-700">
                 Add Annotation
             </a>
@@ -32,9 +36,6 @@ instance View IndexView where
             {forEach rootAnnotations (renderAnnotation childrenOf)}
         </div>
     |]
-  where
-    rootAnnotations = filter (\a -> isNothing a.parentId) annotations
-    childrenOf parent = filter (\a -> a.parentId == Just parent.id) annotations
 
 renderAnnotation :: (Annotation -> [Annotation]) -> Annotation -> Html
 renderAnnotation childrenOf a = [hsx|
@@ -47,16 +48,14 @@ renderAnnotation childrenOf a = [hsx|
                 {a.severity}
             </span>
             <span class="text-xs text-gray-400">{a.actorType}</span>
-            {if isJust a.retractedAt
-                then [hsx|<span class="text-xs text-red-400 italic">retracted</span>|]
-                else mempty}
+            {if isJust a.retractedAt then retractedBadge else mempty}
             <span class="ml-auto text-xs text-gray-300">{show a.createdAt}</span>
         </div>
         <p class="text-sm text-gray-700">{a.body}</p>
         <div class="mt-2 flex gap-2">
-            <a href={NewAnnotationAction { widgetId = a.widgetId }}
+            <a href={NewAnnotationAction (a.widgetId)}
                class="text-xs text-indigo-500 hover:text-indigo-700">Reply</a>
-            <a href={ShowAnnotationAction { annotationId = a.id }}
+            <a href={ShowAnnotationAction (a.id)}
                class="text-xs text-gray-400 hover:text-gray-600">Details / Escalate</a>
         </div>
         <div class="ml-6 mt-3 space-y-3">
@@ -65,6 +64,9 @@ renderAnnotation childrenOf a = [hsx|
     </div>
 |]
 
+retractedBadge :: Html
+retractedBadge = [hsx|<span class="text-xs text-red-400 italic">retracted</span>|]
+
 severityClass :: Text -> Text
 severityClass "low"      = "text-xs px-2 py-0.5 rounded bg-gray-100 text-gray-500"
 severityClass "medium"   = "text-xs px-2 py-0.5 rounded bg-blue-100 text-blue-700"