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/FederatedPolicyOverlays/PolicyComplianceDashboard.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 data PolicyComplianceDashboardView = PolicyComplianceDashboardView
     { overlays  :: ![FederatedPolicyOverlay]
@@ -20,17 +21,7 @@ instance View PolicyComplianceDashboardView where
                class="text-sm text-gray-500 hover:underline">← All Policies</a>
         </div>
 
-        {if null overlays
-            then [hsx|
-                <div class="bg-gray-50 rounded-lg border border-gray-200 p-8 text-center">
-                    <p class="text-gray-400 text-sm">No active policy overlays.</p>
-                </div>
-            |]
-            else [hsx|
-                <div class="space-y-4">
-                    {forEach overlays renderOverlayRow}
-                </div>
-            |]}
+        {renderComplianceOverlays overlays}
 
         <div class="mt-8 bg-white rounded-lg border border-gray-200 p-6">
             <h2 class="text-lg font-medium text-gray-800 mb-4">Overall Coverage</h2>
@@ -51,13 +42,25 @@ instance View PolicyComplianceDashboardView where
         </div>
     |]
       where
-        decisionIdsWithPolicy = map (.requirementId) policies |> catMaybes |> map show
+        decisionIdsWithPolicy = map (show . (.decisionId)) policies
         coveredDecisions = length $ filter (\d -> show d.id `elem` decisionIdsWithPolicy) decisions
         totalDecisions   = length decisions
         coveragePct :: Int
         coveragePct = if totalDecisions == 0 then 0
                       else (coveredDecisions * 100) `div` totalDecisions
 
+        renderComplianceOverlays :: [FederatedPolicyOverlay] -> Html
+        renderComplianceOverlays [] = [hsx|
+            <div class="bg-gray-50 rounded-lg border border-gray-200 p-8 text-center">
+                <p class="text-gray-400 text-sm">No active policy overlays.</p>
+            </div>
+        |]
+        renderComplianceOverlays os = [hsx|
+            <div class="space-y-4">
+                {forEach os renderOverlayRow}
+            </div>
+        |]
+
         renderOverlayRow :: FederatedPolicyOverlay -> Html
         renderOverlayRow o = [hsx|
             <div class="bg-white rounded-lg border border-gray-200 p-5">