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/AgentDelegations/Index.hs

@@ -1,6 +1,6 @@
 module Web.View.AgentDelegations.Index where
 
-import Web.View.Prelude
+import IHP.ViewPrelude
 
 data IndexView = IndexView
     { delegations :: ![AgentDelegation] }

Web/View/AgentDelegations/Show.hs

@@ -1,7 +1,8 @@
 module Web.View.AgentDelegations.Show where
 
-import Web.View.Prelude
+import IHP.ViewPrelude
 import Web.View.AgentDelegations.Index (statusBadge)
+import Data.Aeson (Value)
 
 data ShowView = ShowView
     { delegation      :: !AgentDelegation
@@ -43,22 +44,24 @@ instance View ShowView where
                 </div>
             </div>
 
-            {case mParentProposal of
-                Nothing -> mempty
-                Just p  -> [hsx|
-                    <div>
-                        <p class="text-xs text-gray-500 mb-1">Parent Proposal</p>
-                        <p class="text-sm font-mono text-gray-600">{p.proposalType} — {p.status}</p>
-                    </div>
-                |]}
+            {maybe mempty renderParentProposal mParentProposal}
 
-            {case delegation.result of
-                Nothing -> mempty
-                Just r  -> [hsx|
-                    <div>
-                        <h2 class="text-lg font-semibold text-gray-800 mb-2">Result</h2>
-                        <pre class="bg-gray-100 rounded p-4 text-sm overflow-auto">{show r}</pre>
-                    </div>
-                |]}
+            {maybe mempty renderDelegationResult delegation.result}
         </div>
     |]
+
+renderParentProposal :: AgentProposal -> Html
+renderParentProposal p = [hsx|
+    <div>
+        <p class="text-xs text-gray-500 mb-1">Parent Proposal</p>
+        <p class="text-sm font-mono text-gray-600">{p.proposalType} — {p.status}</p>
+    </div>
+|]
+
+renderDelegationResult :: Value -> Html
+renderDelegationResult r = [hsx|
+    <div>
+        <h2 class="text-lg font-semibold text-gray-800 mb-2">Result</h2>
+        <pre class="bg-gray-100 rounded p-4 text-sm overflow-auto">{show r}</pre>
+    </div>
+|]