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/Index.hs

@@ -4,6 +4,7 @@ import Web.Types
 import Generated.Types
 import IHP.Prelude
 import IHP.ViewPrelude
+import Web.Routes ()
 
 data IndexView = IndexView
     { proposals     :: ![AgentProposal]
@@ -30,27 +31,34 @@ instance View IndexView where
                 <span class="text-gray-400 text-xs self-center mr-1">Type:</span>
                 <a href={agentProposalsUrl Nothing mStatusFilter}
                    class={typeTabClass Nothing mTypeFilter}>All</a>
-                {forEach allProposalTypes (\t -> [hsx|
-                    <a href={agentProposalsUrl (Just t) mStatusFilter}
-                       class={typeTabClass (Just t) mTypeFilter}>{t}</a>
-                |])}
+                {forEach allProposalTypes (renderTypeTab mStatusFilter mTypeFilter)}
             </div>
             <div class="flex gap-1 text-sm flex-wrap">
                 <span class="text-gray-400 text-xs self-center mr-1">Status:</span>
                 <a href={agentProposalsUrl mTypeFilter Nothing}
                    class={typeTabClass Nothing mStatusFilter}>All</a>
-                {forEach allStatuses (\s -> [hsx|
-                    <a href={agentProposalsUrl mTypeFilter (Just s)}
-                       class={typeTabClass (Just s) mStatusFilter}>{s}</a>
-                |])}
+                {forEach allStatuses (renderStatusTab mTypeFilter mStatusFilter)}
             </div>
         </div>
 
-        {if null proposals
-            then [hsx|<p class="text-sm text-gray-400">No proposals found.</p>|]
-            else renderTable proposals widgets}
+        {if null proposals then noProposalsMsg else renderTable proposals widgets}
     |]
 
+noProposalsMsg :: Html
+noProposalsMsg = [hsx|<p class="text-sm text-gray-400">No proposals found.</p>|]
+
+renderTypeTab :: Maybe Text -> Maybe Text -> Text -> Html
+renderTypeTab mStatusFilter mTypeFilter t = [hsx|
+    <a href={agentProposalsUrl (Just t) mStatusFilter}
+       class={typeTabClass (Just t) mTypeFilter}>{t}</a>
+|]
+
+renderStatusTab :: Maybe Text -> Maybe Text -> Text -> Html
+renderStatusTab mTypeFilter mStatusFilter s = [hsx|
+    <a href={agentProposalsUrl mTypeFilter (Just s)}
+       class={typeTabClass (Just s) mStatusFilter}>{s}</a>
+|]
+
 agentProposalsUrl :: Maybe Text -> Maybe Text -> Text
 agentProposalsUrl mt ms =
     let parts = catMaybes
@@ -83,7 +91,7 @@ renderRow :: [Widget] -> AgentProposal -> Html
 renderRow widgets p = [hsx|
     <tr class="hover:bg-gray-50">
         <td class="px-4 py-3">
-            <a href={ShowAgentProposalAction { agentProposalId = p.id }}
+            <a href={ShowAgentProposalAction (p.id)}
                class={proposalTypeBadge p.proposalType <> " text-xs px-2 py-0.5 rounded font-medium"}>
                 {p.proposalType}
             </a>
@@ -99,9 +107,9 @@ renderRow widgets p = [hsx|
     </tr>
 |]
 
-widgetName :: [Widget] -> Maybe (Id Widget) -> Text
+widgetName :: [Widget] -> Maybe UUID -> Text
 widgetName _       Nothing    = "—"
-widgetName widgets (Just wid) = maybe "(unknown)" (.name) (find (\w -> w.id == wid) widgets)
+widgetName widgets (Just wid) = maybe "(unknown)" (.name) (find (\w -> toUUID w.id == wid) widgets)
 
 renderConfidenceBar :: Maybe Double -> Html
 renderConfidenceBar Nothing  = [hsx|<span class="text-gray-300 text-xs">—</span>|]