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/WidgetPatterns/New.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 data NewView = NewView
     { pattern     :: !WidgetPattern
@@ -36,17 +37,13 @@ renderForm pattern hubs widgetTypes = [hsx|
             <div>
                 <label class="block text-sm font-medium text-gray-700 mb-1">Hub</label>
                 <select name="hubId" class="w-full border border-gray-300 rounded px-3 py-2 text-sm">
-                    {forEach hubs (\h -> [hsx|
-                        <option value={tshow h.id}>{h.name}</option>
-                    |])}
+                    {forEach hubs renderHubOption}
                 </select>
             </div>
             <div>
                 <label class="block text-sm font-medium text-gray-700 mb-1">Widget Type</label>
                 <select name="widgetType" class="w-full border border-gray-300 rounded px-3 py-2 text-sm font-mono">
-                    {forEach widgetTypes (\(n, l) -> [hsx|
-                        <option value={n}>{l} ({n})</option>
-                    |])}
+                    {forEach widgetTypes renderWidgetTypeOption}
                 </select>
             </div>
             <div>
@@ -62,3 +59,9 @@ renderForm pattern hubs widgetTypes = [hsx|
         </div>
     </form>
 |]
+
+renderHubOption :: Hub -> Html
+renderHubOption h = [hsx|<option value={tshow h.id}>{h.name}</option>|]
+
+renderWidgetTypeOption :: (Text, Text) -> Html
+renderWidgetTypeOption (n, l) = [hsx|<option value={n}>{l} ({n})</option>|]