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/FederatedPolicyOverlays/Show.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 import Web.View.FederatedPolicyOverlays.Index (statusBadge)
 
 data ShowView = ShowView
@@ -40,31 +41,36 @@ instance View ShowView where
                         <dt class="text-gray-500">Created</dt>
                         <dd>{show overlay.createdAt}</dd>
                     </div>
-                    {whenJust overlay.notes \n -> [hsx|
-                        <div class="col-span-2">
-                            <dt class="text-gray-500">Notes</dt>
-                            <dd class="text-gray-700">{n}</dd>
-                        </div>
-                    |]}
+                    {maybe mempty renderOverlayNotes overlay.notes}
                 </dl>
             </div>
 
             <div class="mt-4 flex gap-4">
-                {if overlay.status == "draft"
-                    then [hsx|
-                        <a href={EditFederatedPolicyOverlayAction { federatedPolicyOverlayId = overlay.id }}
-                           class="text-sm text-blue-600 hover:underline">Edit</a>
-                        <a href={ActivateFederatedPolicyAction { federatedPolicyOverlayId = overlay.id }}
-                           class="text-sm text-green-600 hover:underline">Activate</a>
-                    |]
-                    else mempty}
-                {if overlay.status == "active"
-                    then [hsx|
-                        <a href={RetireFederatedPolicyAction { federatedPolicyOverlayId = overlay.id }}
-                           class="text-sm text-red-600 hover:underline"
-                           onclick="return confirm('Retire this policy overlay?')">Retire</a>
-                    |]
-                    else mempty}
+                {if overlay.status == "draft" then renderDraftActions overlay.id else mempty}
+                {if overlay.status == "active" then renderRetireAction overlay.id else mempty}
             </div>
         </div>
     |]
+
+renderDraftActions :: Id FederatedPolicyOverlay -> Html
+renderDraftActions oid = [hsx|
+    <a href={EditFederatedPolicyOverlayAction (oid)}
+       class="text-sm text-blue-600 hover:underline">Edit</a>
+    <a href={ActivateFederatedPolicyAction (oid)}
+       class="text-sm text-green-600 hover:underline">Activate</a>
+|]
+
+renderRetireAction :: Id FederatedPolicyOverlay -> Html
+renderRetireAction oid = [hsx|
+    <a href={RetireFederatedPolicyAction (oid)}
+       class="text-sm text-red-600 hover:underline"
+       onclick="return confirm('Retire this policy overlay?')">Retire</a>
+|]
+
+renderOverlayNotes :: Text -> Html
+renderOverlayNotes n = [hsx|
+    <div class="col-span-2">
+        <dt class="text-gray-500">Notes</dt>
+        <dd class="text-gray-700">{n}</dd>
+    </div>
+|]