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/ModelRoutingPolicies/Index.hs

@@ -1,6 +1,6 @@
 module Web.View.ModelRoutingPolicies.Index where
 
-import Web.View.Prelude
+import IHP.ViewPrelude
 
 data IndexView = IndexView
     { policies :: ![ModelRoutingPolicy]
@@ -51,9 +51,7 @@ instance View IndexView where
                 </td>
                 <td class="px-6 py-4 text-sm text-gray-500">{show p.priority}</td>
                 <td class="px-6 py-4 text-sm">
-                    {if p.isActive
-                        then [hsx|<span class="text-green-600">Yes</span>|]
-                        else [hsx|<span class="text-gray-400">No</span>|]}
+                    {renderActiveStatus p.isActive}
                 </td>
                 <td class="px-6 py-4 text-right">
                     <a href={DeleteModelRoutingPolicyAction p.id}
@@ -63,3 +61,7 @@ instance View IndexView where
                 </td>
             </tr>
         |]
+
+renderActiveStatus :: Bool -> Html
+renderActiveStatus True  = [hsx|<span class="text-green-600">Yes</span>|]
+renderActiveStatus False = [hsx|<span class="text-gray-400">No</span>|]