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/AiGovernancePolicies/Index.hs

@@ -1,6 +1,6 @@
 module Web.View.AiGovernancePolicies.Index where
 
-import Web.View.Prelude
+import IHP.ViewPrelude
 
 data IndexView = IndexView
     { policies :: ![AiGovernancePolicy]
@@ -48,9 +48,7 @@ instance View IndexView where
                 <td class="px-6 py-4 text-sm font-mono">{p.artifactType}</td>
                 <td class="px-6 py-4 text-sm text-gray-600">{show p.allowedActions}</td>
                 <td class="px-6 py-4">
-                    {if p.isActive
-                        then [hsx|<span class="text-green-600 text-sm">Active</span>|]
-                        else [hsx|<span class="text-gray-400 text-sm">Inactive</span>|]}
+                    {renderActiveStatus p.isActive}
                 </td>
                 <td class="px-6 py-4 text-right">
                     <a href={ToggleAiGovernancePolicyAction p.id}
@@ -61,3 +59,7 @@ instance View IndexView where
                 </td>
             </tr>
         |]
+
+renderActiveStatus :: Bool -> Html
+renderActiveStatus True  = [hsx|<span class="text-green-600 text-sm">Active</span>|]
+renderActiveStatus False = [hsx|<span class="text-gray-400 text-sm">Inactive</span>|]

Web/View/AiGovernancePolicies/New.hs

@@ -1,6 +1,6 @@
 module Web.View.AiGovernancePolicies.New where
 
-import Web.View.Prelude
+import IHP.ViewPrelude
 
 data NewView = NewView
     { policy :: !AiGovernancePolicy
@@ -8,6 +8,20 @@ data NewView = NewView
     , agents :: ![AgentRegistration]
     }
 
+renderHubOption :: Hub -> Html
+renderHubOption h = [hsx|<option value={show h.id}>{h.name}</option>|]
+
+renderAgentOption :: AgentRegistration -> Html
+renderAgentOption a = [hsx|<option value={show a.id}>{a.name}</option>|]
+
+renderActionOption :: (Text, Text) -> Html
+renderActionOption (val, lbl) = [hsx|
+    <label class="flex items-center gap-2 text-sm">
+        <input type="checkbox" name="allowedActions" value={val} class="rounded" />
+        <span>{lbl}</span>
+    </label>
+|]
+
 allowedActionOptions :: [(Text, Text)]
 allowedActionOptions =
     [ ("read",       "read — agent may read artifacts")
@@ -25,25 +39,20 @@ instance View NewView where
                     <div>
                         <label class="block text-sm font-medium text-gray-700 mb-1">Hub</label>
                         <select name="hubId" class="block w-full border-gray-300 rounded-md shadow-sm text-sm">
-                            {forEach hubs \h -> [hsx|<option value={show h.id}>{h.name}</option>|]}
+                            {forEach hubs renderHubOption}
                         </select>
                     </div>
                     <div>
                         <label class="block text-sm font-medium text-gray-700 mb-1">Agent</label>
                         <select name="agentRegistrationId" class="block w-full border-gray-300 rounded-md shadow-sm text-sm">
-                            {forEach agents \a -> [hsx|<option value={show a.id}>{a.name}</option>|]}
+                            {forEach agents renderAgentOption}
                         </select>
                     </div>
-                    <div>{(textField #artifactType) { label = "Artifact Type", placeholder = "e.g. requirement_candidate, annotation, decision_record" }}</div>
+                    <div>{(textField #artifactType) { fieldLabel = "Artifact Type", placeholder = "e.g. requirement_candidate, annotation, decision_record" }}</div>
                     <div>
                         <label class="block text-sm font-medium text-gray-700 mb-2">Allowed Actions</label>
                         <div class="space-y-2">
-                            {forEach allowedActionOptions \(val, label) -> [hsx|
-                                <label class="flex items-center gap-2 text-sm">
-                                    <input type="checkbox" name="allowedActions" value={val} class="rounded" />
-                                    <span>{label}</span>
-                                </label>
-                            |]}
+                            {forEach allowedActionOptions renderActionOption}
                         </div>
                     </div>
                     <div class="flex gap-3 pt-2">