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/Requirements/Index.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 data IndexView = IndexView
     { requirements :: ![Requirement]
@@ -15,11 +16,13 @@ instance View IndexView where
         <div class="flex items-center justify-between mb-6">
             <h1 class="text-2xl font-semibold">Requirements</h1>
         </div>
-        {if null requirements
-            then [hsx|<p class="text-sm text-gray-400">No requirements yet. Promote an accepted candidate to create one.</p>|]
-            else renderTable requirements candidates}
+        {renderRequirementsSection requirements candidates}
     |]
 
+renderRequirementsSection :: [Requirement] -> [RequirementCandidate] -> Html
+renderRequirementsSection [] _ = [hsx|<p class="text-sm text-gray-400">No requirements yet. Promote an accepted candidate to create one.</p>|]
+renderRequirementsSection reqs candidates = renderTable reqs candidates
+
 renderTable :: [Requirement] -> [RequirementCandidate] -> Html
 renderTable reqs candidates = [hsx|
     <div class="bg-white rounded-lg border border-gray-200 overflow-hidden">
@@ -43,7 +46,7 @@ renderRow :: [RequirementCandidate] -> Requirement -> Html
 renderRow candidates req = [hsx|
     <tr class="hover:bg-gray-50">
         <td class="px-4 py-3">
-            <a href={ShowRequirementAction { requirementId = req.id }}
+            <a href={ShowRequirementAction (req.id)}
                class="text-indigo-600 hover:text-indigo-800 font-medium">{req.title}</a>
         </td>
         <td class="px-4 py-3">

Web/View/Requirements/Show.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 data ShowView = ShowView
     { requirement :: !Requirement
@@ -35,7 +36,7 @@ instance View ShowView where
             <!-- Source candidate -->
             <div class="bg-white rounded-lg border border-gray-200 px-6 py-4">
                 <h2 class="text-sm font-semibold text-gray-700 mb-2">Source Candidate</h2>
-                <a href={ShowRequirementCandidateAction { requirementCandidateId = candidate.id }}
+                <a href={ShowRequirementCandidateAction (candidate.id)}
                    class="text-sm text-indigo-600 hover:text-indigo-800">{candidate.title}</a>
                 <p class="text-xs text-gray-400 mt-1">Widget: {widget.name}</p>
             </div>
@@ -43,15 +44,7 @@ instance View ShowView where
             <!-- Linked decision -->
             <div class="bg-white rounded-lg border border-gray-200 px-6 py-4">
                 <h2 class="text-sm font-semibold text-gray-700 mb-2">Linked Decision</h2>
-                {case mDecision of
-                    Nothing -> [hsx|<p class="text-sm text-gray-400">No decision linked yet.</p>|]
-                    Just dr -> [hsx|
-                        <a href={ShowDecisionRecordAction { decisionRecordId = dr.id }}
-                           class="text-sm text-indigo-600 hover:text-indigo-800">{dr.title}</a>
-                        <span class={outcomeClass dr.outcome <> " text-xs px-2 py-0.5 rounded font-medium ml-2"}>
-                            {dr.outcome}
-                        </span>
-                    |]}
+                {renderLinkedDecision mDecision}
             </div>
         </div>
     |]
@@ -62,6 +55,16 @@ reqStatusClass "superseded" = "bg-yellow-100 text-yellow-800"
 reqStatusClass "withdrawn"  = "bg-gray-100 text-gray-500"
 reqStatusClass _            = "bg-gray-100 text-gray-600"
 
+renderLinkedDecision :: Maybe DecisionRecord -> Html
+renderLinkedDecision Nothing   = [hsx|<p class="text-sm text-gray-400">No decision linked yet.</p>|]
+renderLinkedDecision (Just dr) = [hsx|
+    <a href={ShowDecisionRecordAction (dr.id)}
+       class="text-sm text-indigo-600 hover:text-indigo-800">{dr.title}</a>
+    <span class={outcomeClass dr.outcome <> " text-xs px-2 py-0.5 rounded font-medium ml-2"}>
+        {dr.outcome}
+    </span>
+|]
+
 outcomeClass :: Text -> Text
 outcomeClass "accepted"  = "bg-green-100 text-green-800"
 outcomeClass "rejected"  = "bg-red-100 text-red-800"