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/AgentProposals/Show.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 data ShowView = ShowView
     { proposal    :: !AgentProposal
@@ -55,9 +56,7 @@ instance View ShowView where
         </div>
 
         <!-- Review section -->
-        {case mReview of
-            Just review -> renderExistingReview review users
-            Nothing     -> renderReviewForm proposal.id proposal.status}
+        {renderReviewSection mReview users proposal.id proposal.status}
 
         <!-- Attribution footer -->
         <div class="text-xs text-gray-400 mt-4 border-t pt-3">
@@ -66,6 +65,12 @@ instance View ShowView where
         </div>
     |]
 
+renderReviewSection :: Maybe AgentReviewRecord -> [User] -> Id AgentProposal -> Text -> Html
+renderReviewSection mReview users proposalId status =
+    case mReview of
+        Just review -> renderExistingReview review users
+        Nothing     -> renderReviewForm proposalId status
+
 renderConfidences :: [ConfidenceAnnotation] -> Html
 renderConfidences cs = [hsx|
     <div class="bg-white rounded-lg border border-gray-200 p-5 mb-5">
@@ -89,7 +94,7 @@ renderConfidenceRow c =
             <div class="w-full bg-gray-100 rounded h-2">
                 <div class="bg-indigo-400 rounded h-2" style={barWidth}></div>
             </div>
-            {maybe mempty (\e -> [hsx|<p class="text-xs text-gray-400 mt-0.5">{e}</p>|]) c.explanation}
+            {maybe mempty renderConfExplanation c.explanation}
         </div>
     |]
 
@@ -103,7 +108,7 @@ renderExistingReview review users = [hsx|
             </span>
             <span class="text-xs text-gray-400">by {reviewerName users review.reviewerId} at {show review.reviewedAt}</span>
         </div>
-        {maybe mempty (\n -> [hsx|<p class="text-sm text-gray-600">{n}</p>|]) review.notes}
+        {maybe mempty renderReviewNote review.notes}
     </div>
 |]
 
@@ -119,7 +124,7 @@ renderReviewForm pid status
                     class="w-full border border-gray-300 rounded px-3 py-2 text-sm"></textarea>
             </div>
             <div class="flex gap-3">
-                <form method="POST" action={AcceptProposalAction { agentProposalId = pid }}
+                <form method="POST" action={AcceptProposalAction (pid)}
                       onsubmit="document.getElementById('accept-notes').value = document.getElementById('review-notes').value">
                     <input type="hidden" name="notes" id="accept-notes" />
                     <button type="submit"
@@ -127,7 +132,7 @@ renderReviewForm pid status
                         Accept
                     </button>
                 </form>
-                <form method="POST" action={RejectProposalAction { agentProposalId = pid }}
+                <form method="POST" action={RejectProposalAction (pid)}
                       onsubmit="document.getElementById('reject-notes').value = document.getElementById('review-notes').value">
                     <input type="hidden" name="notes" id="reject-notes" />
                     <button type="submit"
@@ -139,6 +144,12 @@ renderReviewForm pid status
         </div>
     |]
 
+renderConfExplanation :: Text -> Html
+renderConfExplanation e = [hsx|<p class="text-xs text-gray-400 mt-0.5">{e}</p>|]
+
+renderReviewNote :: Text -> Html
+renderReviewNote n = [hsx|<p class="text-sm text-gray-600">{n}</p>|]
+
 reviewerName :: [User] -> Maybe (Id User) -> Text
 reviewerName _     Nothing    = "unknown"
 reviewerName users (Just uid) = maybe "(unknown)" (.name) (find (\u -> u.id == uid) users)