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/HubRegistry/Index.hs

@@ -1,10 +1,11 @@
 module Web.View.HubRegistry.Index where
 
 import Web.Types
-import Web.Controller.HubRegistry (HubRegistryRow(..), GaafStatus(..), gaafStatus)
+import Web.Types (HubRegistryRow(..), GaafStatus(..), gaafStatus)
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 import Data.Aeson (Value(..))
 import qualified Data.Vector as V
 
@@ -29,12 +30,13 @@ instance View IndexView where
 
         <div class="space-y-3">
             {forEach registryRows renderRow}
-            {if null registryRows
-                then [hsx|<p class="text-sm text-gray-400">No hubs registered yet.</p>|]
-                else mempty}
+            {if null registryRows then noHubsMsg else mempty}
         </div>
     |]
 
+noHubsMsg :: Html
+noHubsMsg = [hsx|<p class="text-sm text-gray-400">No hubs registered yet.</p>|]
+
 renderRow :: HubRegistryRow -> Html
 renderRow row@HubRegistryRow { hub, mManifest, mLatestSnapshot } =
     let gs = gaafStatus mManifest
@@ -46,7 +48,7 @@ renderRow row@HubRegistryRow { hub, mManifest, mLatestSnapshot } =
     <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={ShowHubRegistryAction { hubId = hub.id }}
+                <a href={ShowHubRegistryAction (hub.id)}
                    class="font-medium text-indigo-700 hover:underline">
                     {hub.name}
                 </a>
@@ -74,7 +76,8 @@ gaafBadge GaafNoManifest =
 
 healthScoreBadge :: Int -> Html
 healthScoreBadge s =
-    let cls = if s >= 80 then "bg-green-100 text-green-800"
+    let cls :: Text
+        cls = if s >= 80 then "bg-green-100 text-green-800"
               else if s >= 50 then "bg-amber-100 text-amber-800"
               else "bg-red-100 text-red-700"
     in [hsx|<span class={"px-2 py-0.5 rounded text-xs " <> cls}>health {tshow s}</span>|]