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/Show.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 data ShowView = ShowView
     { widget     :: !Widget
@@ -16,9 +17,9 @@ instance View ShowView where
         <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>
-            <a href={WidgetAnnotationsAction { widgetId = widget.id }} class="hover:text-gray-700">Annotations</a>
+            <a href={WidgetAnnotationsAction (widget.id)} class="hover:text-gray-700">Annotations</a>
             <span>/</span>
             <span>Detail</span>
         </div>
@@ -32,9 +33,7 @@ instance View ShowView where
                     <span class={severityClass annotation.severity}>
                         {annotation.severity}
                     </span>
-                    {if isJust annotation.retractedAt
-                        then [hsx|<span class="text-xs text-red-400 italic">retracted</span>|]
-                        else mempty}
+                    {if isJust annotation.retractedAt then retractedBadge else mempty}
                     <span class="ml-auto text-xs text-gray-400">{show annotation.createdAt}</span>
                 </div>
                 <p class="text-sm text-gray-800 leading-relaxed">{annotation.body}</p>
@@ -50,8 +49,7 @@ instance View ShowView where
 renderEscalation :: Annotation -> Maybe RequirementCandidate -> Html
 renderEscalation annotation Nothing = [hsx|
     <p class="text-sm text-gray-500 mb-3">This annotation has not been escalated yet.</p>
-    <form method="POST" action={EscalateAnnotationAction { annotationId = annotation.id }}>
-        {hiddenField "authenticity_token"}
+    <form method="POST" action={EscalateAnnotationAction (annotation.id)}>
         <button type="submit"
                 class="text-sm bg-amber-600 text-white px-4 py-2 rounded hover:bg-amber-700">
             Escalate to Requirement Candidate
@@ -60,7 +58,7 @@ renderEscalation annotation Nothing = [hsx|
 |]
 renderEscalation _ (Just candidate) = [hsx|
     <p class="text-sm text-gray-600 mb-2">Escalated to:</p>
-    <a href={ShowRequirementCandidateAction { requirementCandidateId = candidate.id }}
+    <a href={ShowRequirementCandidateAction (candidate.id)}
        class="text-sm text-indigo-600 hover:text-indigo-800 font-medium">
         {candidate.title} →
     </a>
@@ -69,6 +67,9 @@ renderEscalation _ (Just candidate) = [hsx|
     </span>
 |]
 
+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"