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/WidgetPatterns/Index.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 -- Row: WidgetPattern fields + adopter_count + latest_version
 type PatternIndexRow = (WidgetPattern, Int, Maybe Int)
@@ -27,31 +28,39 @@ instance View IndexView where
 
         <div class="space-y-3">
             {forEach patterns renderPatternRow}
-            {if null patterns
-                then [hsx|<p class="text-sm text-gray-400">No published patterns yet.</p>|]
-                else mempty}
+            {if null patterns then noPatternsMsg else mempty}
         </div>
     |]
 
+noPatternsMsg :: Html
+noPatternsMsg = [hsx|<p class="text-sm text-gray-400">No published patterns yet.</p>|]
+
 renderPatternRow :: PatternIndexRow -> Html
 renderPatternRow (pattern, adopterCount, mVersion) = [hsx|
     <div class="bg-white rounded-lg border border-gray-200 p-4 hover:border-indigo-200">
         <div class="flex items-center justify-between">
             <div class="flex items-center gap-3">
-                <a href={ShowWidgetPatternAction { widgetPatternId = pattern.id }}
+                <a href={ShowWidgetPatternAction (pattern.id)}
                    class="font-medium text-indigo-700 hover:underline">
                     {pattern.name}
                 </a>
                 <span class="font-mono text-xs text-gray-400">{pattern.widgetType}</span>
-                {if pattern.isCrossHub
-                    then [hsx|<span class="px-2 py-0.5 rounded text-xs bg-purple-100 text-purple-700">cross-hub</span>|]
-                    else mempty}
+                {if pattern.isCrossHub then crossHubChip else mempty}
             </div>
             <div class="flex items-center gap-3 text-xs text-gray-500">
                 <span>{tshow adopterCount} adopters</span>
-                {maybe mempty (\v -> [hsx|<span class="font-mono">v{tshow v}</span>|]) mVersion}
+                {maybe mempty renderVersionChip mVersion}
             </div>
         </div>
-        {maybe mempty (\d -> [hsx|<p class="text-xs text-gray-500 mt-1">{d}</p>|]) pattern.description}
+        {maybe mempty renderPatternDesc pattern.description}
     </div>
 |]
+
+crossHubChip :: Html
+crossHubChip = [hsx|<span class="px-2 py-0.5 rounded text-xs bg-purple-100 text-purple-700">cross-hub</span>|]
+
+renderVersionChip :: Int -> Html
+renderVersionChip v = [hsx|<span class="font-mono">v{tshow v}</span>|]
+
+renderPatternDesc :: Text -> Html
+renderPatternDesc d = [hsx|<p class="text-xs text-gray-500 mt-1">{d}</p>|]