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/MarketplaceDashboard/Show.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 import Data.Aeson (Value(..), decode, encode)
 import qualified Data.ByteString.Lazy.Char8 as BL
 
@@ -35,18 +36,7 @@ instance View ShowView where
 
         {searchBar searchQuery selectedType sortOrder widgetTypeOptions}
 
-        {if not (null trending)
-            then [hsx|
-                <div class="mb-6">
-                    <h2 class="text-sm font-semibold text-gray-600 uppercase tracking-wide mb-3">
-                        Trending (last 30 days)
-                    </h2>
-                    <div class="flex flex-wrap gap-2">
-                        {forEach trending renderTrendingChip}
-                    </div>
-                </div>
-            |]
-            else mempty}
+        {renderTrendingSection trending}
 
         <div class="grid grid-cols-2 gap-8">
             <div>
@@ -56,9 +46,7 @@ instance View ShowView where
                 </h2>
                 <div class="space-y-2">
                     {forEach patterns renderPatternRow}
-                    {if null patterns
-                        then [hsx|<p class="text-sm text-gray-400">No patterns match your search.</p>|]
-                        else mempty}
+                    {if null patterns then noPatternsMsg else mempty}
                 </div>
             </div>
             <div>
@@ -68,9 +56,7 @@ instance View ShowView where
                 </h2>
                 <div class="space-y-2">
                     {forEach templates renderTemplateRow}
-                    {if null templates
-                        then [hsx|<p class="text-sm text-gray-400">No templates match your search.</p>|]
-                        else mempty}
+                    {if null templates then noTemplatesMsg else mempty}
                 </div>
             </div>
         </div>
@@ -89,9 +75,7 @@ searchBar mSearch mWType sortOrder wtOptions = [hsx|
             <label class="block text-xs text-gray-500 mb-1">Widget Type</label>
             <select name="widgetType" class="border border-gray-300 rounded px-3 py-2 text-sm font-mono">
                 <option value="">All types</option>
-                {forEach wtOptions (\(n, l) -> [hsx|
-                    <option value={n} selected={mWType == Just n}>{l}</option>
-                |])}
+                {forEach wtOptions (renderWtOption mWType)}
             </select>
         </div>
         <div>
@@ -113,14 +97,14 @@ renderPatternRow :: PatternRow -> Html
 renderPatternRow (pattern, adopterCount) = [hsx|
     <div class="bg-white rounded border border-gray-200 p-3 hover:border-indigo-200">
         <div class="flex items-center justify-between">
-            <a href={ShowWidgetPatternAction { widgetPatternId = pattern.id }}
+            <a href={ShowWidgetPatternAction (pattern.id)}
                class="font-medium text-sm text-indigo-700 hover:underline">
                 {pattern.name}
             </a>
             <span class="text-xs text-gray-400">{tshow adopterCount} adopters</span>
         </div>
         <span class="font-mono text-xs text-gray-400">{pattern.widgetType}</span>
-        {maybe mempty (\d -> [hsx|<p class="text-xs text-gray-500 mt-1 truncate">{d}</p>|]) pattern.description}
+        {maybe mempty renderPatternDesc pattern.description}
     </div>
 |]
 
@@ -128,24 +112,22 @@ renderTemplateRow :: TemplateRow -> Html
 renderTemplateRow (template, cloneCount) = [hsx|
     <div class="bg-white rounded border border-gray-200 p-3 hover:border-indigo-200">
         <div class="flex items-center justify-between">
-            <a href={ShowGovernanceTemplateAction { governanceTemplateId = template.id }}
+            <a href={ShowGovernanceTemplateAction (template.id)}
                class="font-medium text-sm text-indigo-700 hover:underline">
                 {template.name}
             </a>
             <span class="text-xs text-gray-400">{tshow cloneCount} clones</span>
         </div>
-        {maybe mempty (\d -> [hsx|<p class="text-xs text-gray-500 mt-1 truncate">{d}</p>|]) template.description}
+        {maybe mempty renderPatternDesc template.description}
         <div class="mt-1 flex flex-wrap gap-1">
-            {forEach (jsonArrayTexts template.categories) (\c -> [hsx|
-                <span class="px-1.5 py-0.5 rounded text-xs bg-blue-50 text-blue-600 font-mono">{c}</span>
-            |])}
+            {forEach (jsonArrayTexts template.categories) renderCategoryChip}
         </div>
     </div>
 |]
 
 renderTrendingChip :: TrendingRow -> Html
 renderTrendingChip (patternId, name, widgetType, count) = [hsx|
-    <a href={ShowWidgetPatternAction { widgetPatternId = patternId }}
+    <a href={ShowWidgetPatternAction (patternId)}
        class="flex items-center gap-1.5 px-3 py-1.5 bg-white rounded border border-gray-200 \
              \text-sm hover:border-indigo-300">
         <span class="font-medium">{name}</span>
@@ -158,3 +140,31 @@ jsonArrayTexts :: Value -> [Text]
 jsonArrayTexts val = case decode (encode val) of
     Just (arr :: [Text]) -> arr
     Nothing              -> []
+
+renderTrendingSection :: [TrendingRow] -> Html
+renderTrendingSection [] = mempty
+renderTrendingSection rows = [hsx|
+    <div class="mb-6">
+        <h2 class="text-sm font-semibold text-gray-600 uppercase tracking-wide mb-3">
+            Trending (last 30 days)
+        </h2>
+        <div class="flex flex-wrap gap-2">
+            {forEach rows renderTrendingChip}
+        </div>
+    </div>
+|]
+
+noPatternsMsg :: Html
+noPatternsMsg = [hsx|<p class="text-sm text-gray-400">No patterns match your search.</p>|]
+
+noTemplatesMsg :: Html
+noTemplatesMsg = [hsx|<p class="text-sm text-gray-400">No templates match your search.</p>|]
+
+renderPatternDesc :: Text -> Html
+renderPatternDesc d = [hsx|<p class="text-xs text-gray-500 mt-1 truncate">{d}</p>|]
+
+renderCategoryChip :: Text -> Html
+renderCategoryChip c = [hsx|<span class="px-1.5 py-0.5 rounded text-xs bg-blue-50 text-blue-600 font-mono">{c}</span>|]
+
+renderWtOption :: Maybe Text -> (Text, Text) -> Html
+renderWtOption mWType (n, l) = [hsx|<option value={n} selected={mWType == Just n}>{l}</option>|]