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/Widgets/New.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 data NewView = NewView
     { widget       :: !Widget
@@ -34,22 +35,23 @@ renderForm widget hubs adapterSpecs widgetTypes policyScopes = formFor widget [h
         <label class="ihp-form-label">Adapter Spec (optional — leave blank for native IHP widget)</label>
         <select name="adapterSpecId" class="ihp-form-field">
             <option value="">— Native IHP widget —</option>
-            {forEach adapterSpecs (\s -> [hsx|
-                <option value={tshow s.id}>{s.name} ({s.framework} v{s.version})</option>
-            |])}
+            {forEach adapterSpecs renderAdapterOption}
         </select>
     </div>
     {submitButton}
 |]
 
+renderAdapterOption :: WidgetAdapterSpec -> Html
+renderAdapterOption s = [hsx|<option value={tshow s.id}>{s.name} ({s.framework} v{s.version})</option>|]
+
 hubOptions :: [Hub] -> [(Text, Id Hub)]
 hubOptions hubs = map (\h -> (h.name, h.id)) hubs
 
 widgetTypeOptions :: [WidgetTypeRegistry] -> [(Text, Text)]
-widgetTypeOptions = map (\r -> (r.label, r.name))
+widgetTypeOptions = map (\r -> (r.label_, r.name))
 
 policyScopeOptions :: [PolicyScopeRegistry] -> [(Text, Text)]
-policyScopeOptions = map (\r -> (r.label, r.name))
+policyScopeOptions = map (\r -> (r.label_, r.name))
 
 statusOptions :: [(Text, Text)]
 statusOptions =