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/OutcomeCorrelations/Index.hs

@@ -1,6 +1,6 @@
 module Web.View.OutcomeCorrelations.Index where
 
-import Web.View.Prelude
+import IHP.ViewPrelude
 
 data IndexView = IndexView
     { correlations :: ![OutcomeCorrelation]
@@ -20,12 +20,7 @@ instance View IndexView where
                     <label class="block text-sm font-medium text-gray-700 mb-1">Filter by Hub</label>
                     <select name="hubId" class="border border-gray-300 rounded-md px-3 py-2 text-sm">
                         <option value="">All hubs</option>
-                        {forM_ hubs \h -> [hsx|
-                            <option value={show h.id}
-                                selected={mHubFilter == Just h.id}>
-                                {h.name}
-                            </option>
-                        |]}
+                        {forEach hubs (renderHubFilterOption mHubFilter)}
                     </select>
                 </div>
                 <button type="submit" class="px-4 py-2 bg-gray-600 text-white rounded-md text-sm hover:bg-gray-700">
@@ -69,3 +64,8 @@ instance View IndexView where
             | s >= 0.7  = "inline-block px-2 py-1 text-xs font-semibold bg-green-100 text-green-800 rounded" :: Text
             | s >= 0.4  = "inline-block px-2 py-1 text-xs font-semibold bg-yellow-100 text-yellow-800 rounded"
             | otherwise = "inline-block px-2 py-1 text-xs font-semibold bg-red-100 text-red-800 rounded"
+
+renderHubFilterOption :: Maybe (Id Hub) -> Hub -> Html
+renderHubFilterOption mFilter h = [hsx|
+    <option value={show h.id} selected={mFilter == Just h.id}>{h.name}</option>
+|]