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/Hubs/FrictionHeatmap.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 import Application.Helper.FrictionScore (scoreBand)
 
 data FrictionHeatmapView = FrictionHeatmapView
@@ -20,11 +21,11 @@ instance View FrictionHeatmapView where
                 <p class="text-sm text-gray-500">{hub.name}</p>
             </div>
             <div class="flex gap-2">
-                <a href={RecomputeFrictionAction { hubId = hub.id }}
+                <a href={RecomputeFrictionAction (hub.id)}
                    class="text-sm bg-indigo-600 text-white px-3 py-1.5 rounded hover:bg-indigo-700">
                     Recompute
                 </a>
-                <a href={ShowHubAction { hubId = hub.id }}
+                <a href={ShowHubAction (hub.id)}
                    class="text-sm border border-gray-300 px-3 py-1.5 rounded hover:bg-gray-50">
                     ← Hub
                 </a>
@@ -38,18 +39,20 @@ instance View FrictionHeatmapView where
             <span><span class="inline-block w-3 h-3 rounded bg-red-100 mr-1"></span>Critical (60+)</span>
         </div>
 
-        {if null widgets
-            then [hsx|<p class="text-sm text-gray-400">No widgets in this hub.</p>|]
-            else [hsx|
-                <div class="grid grid-cols-3 gap-3">
-                    {forEach widgets renderWidgetCard}
-                </div>
-            |]}
+        {renderHeatmapGrid widgets}
     |]
       where
         scoreFor w = maybe 0 (.score) (find (\fs -> fs.widgetId == w.id) frictionScores)
         hasScore w = any (\fs -> fs.widgetId == w.id) frictionScores
 
+        renderHeatmapGrid :: [Widget] -> Html
+        renderHeatmapGrid [] = [hsx|<p class="text-sm text-gray-400">No widgets in this hub.</p>|]
+        renderHeatmapGrid ws = [hsx|
+            <div class="grid grid-cols-3 gap-3">
+                {forEach ws renderWidgetCard}
+            </div>
+        |]
+
         renderWidgetCard :: Widget -> Html
         renderWidgetCard w =
             let s    = scoreFor w
@@ -57,12 +60,14 @@ instance View FrictionHeatmapView where
             in [hsx|
             <div class={"rounded-lg border p-4 " <> band}>
                 <div class="flex items-start justify-between">
-                    <a href={ShowWidgetAction { widgetId = w.id }}
+                    <a href={ShowWidgetAction (w.id)}
                        class="font-medium text-sm hover:underline">{w.name}</a>
-                    {if hasScore w
-                        then [hsx|<span class="text-lg font-bold">{show s}</span>|]
-                        else [hsx|<span class="text-xs text-gray-400">–</span>|]}
+                    {renderScoreBadge (hasScore w) s}
                 </div>
                 <p class="text-xs mt-1 opacity-70">{w.widgetType}</p>
             </div>
             |]
+
+renderScoreBadge :: Bool -> Int -> Html
+renderScoreBadge True  s = [hsx|<span class="text-lg font-bold">{show s}</span>|]
+renderScoreBadge False _ = [hsx|<span class="text-xs text-gray-400">–</span>|]