refactor(storefront): remove supabase shim and restore customer storefronts

The legacy src/lib/supabase.ts shim returned { data: null } for every
query, so 15+ pages were silently rendering empty state — including the
two customer-facing storefronts (tuxedo, indian-river-direct) and
several v1 admin pages. Replace every caller with canonical access:

- New src/actions/storefront.ts server-action module: brand lookup,
  public stops, active products, stop-by-slug, wholesale settings,
  portal config. Uses the shared pg Pool and SECURITY DEFINER RPCs.
- src/actions/brand-settings.ts: getBrandSettingsPublic inlined the
  brands + brand_settings LEFT JOIN wholesale_settings query (the
  RPC it called did not exist; try/catch was masking the failure).
- src/actions/ai/preferences.ts: switched get/saveAIPreferences to
  pool.query.
- src/actions/square-sync-ui.ts: new getSquareQueueCount action for
  SquareSyncWidget (replaces shim count).
- src/app/api/{tuxedo,indian-river-direct}/schedule-pdf/route.ts:
  use pool.query.
- next.config.ts: redirects /admin/{products/:id,reports,taxes,
  settings/{shipping,integrations,billing}} → their v2 / settings
  equivalents, then deleted those pages.
- Deleted src/lib/supabase.ts (no remaining imports).

Tests: 174/175 (unchanged from baseline; pre-existing getAdminUser
mock issue is tracked in Step 5).

src/app/test/page.tsx

@@ -1,21 +0,0 @@
-import { supabase } from "@/lib/supabase";
-
-export const dynamic = "force-dynamic";
-
-export default async function TestPage() {
-  const { data, error } = await supabase
-    .from("brands")
-    .select("*");
-
-  return (
-    <main className="min-h-screen bg-slate-50 p-10">
-      <h1 className="text-3xl font-bold">
-        Supabase Test
-      </h1>
-
-      <pre className="mt-8 rounded-xl bg-black p-6 text-sm text-green-400">
-        {JSON.stringify({ data, error }, null, 2)}
-      </pre>
-    </main>
-  );
-}