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/InstitutionalKnowledge/Show.hs

@@ -1,6 +1,6 @@
 module Web.View.InstitutionalKnowledge.Show where
 
-import Web.View.Prelude
+import IHP.ViewPrelude
 
 data ShowView = ShowView
     { entry     :: !InstitutionalKnowledgeEntry
@@ -22,18 +22,19 @@ instance View ShowView where
                     <span class="text-xs text-gray-400">{show entry.createdAt}</span>
                 </div>
                 <p class="text-gray-800 leading-relaxed text-sm">{entry.summary}</p>
-                {case mDecision of
-                    Nothing -> mempty
-                    Just dr -> [hsx|
-                        <div class="mt-5 border-t pt-4">
-                            <p class="text-xs font-medium text-gray-500 uppercase mb-2">Source Decision</p>
-                            <a href={ShowDecisionRecordAction { decisionRecordId = dr.id }}
-                               class="text-sm text-blue-600 hover:underline">
-                                {dr.title}
-                            </a>
-                            <span class="ml-2 text-xs text-gray-500">({dr.outcome})</span>
-                        </div>
-                    |]}
+                {maybe mempty renderSourceDecision mDecision}
             </div>
         </div>
     |]
+
+renderSourceDecision :: DecisionRecord -> Html
+renderSourceDecision dr = [hsx|
+    <div class="mt-5 border-t pt-4">
+        <p class="text-xs font-medium text-gray-500 uppercase mb-2">Source Decision</p>
+        <a href={ShowDecisionRecordAction (dr.id)}
+           class="text-sm text-blue-600 hover:underline">
+            {dr.title}
+        </a>
+        <span class="ml-2 text-xs text-gray-500">({dr.outcome})</span>
+    </div>
+|]