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/tuxedo/products/sweet-corn-box/page.tsx

@@ -1,7 +1,7 @@
 import type { Metadata } from "next";
 import { Fraunces, JetBrains_Mono } from "next/font/google";
-import { supabase } from "@/lib/supabase";
 import { getBrandSettingsPublic } from "@/actions/brand-settings";
+import { getStorefrontBrandBySlug } from "@/actions/storefront";
 import SweetCornProductPage from "@/components/storefront/SweetCornProductPage";
 
 const fraunces = Fraunces({
@@ -76,14 +76,13 @@ export default async function SweetCornBoxPage() {
   let logoUrlDark: string | null = null;
 
   try {
-    const [brandRes, settingsRes] = await Promise.all([
-      supabase.from("brands").select("id, name").eq("slug", BRAND_SLUG).single(),
+    const [brand, settingsRes] = await Promise.all([
+      getStorefrontBrandBySlug(BRAND_SLUG),
       getBrandSettingsPublic(BRAND_SLUG),
     ]);
-    if (brandRes.data) {
-      const b = brandRes.data as Brand;
-      brandId = b.id;
-      brandName = b.name;
+    if (brand) {
+      brandId = brand.id;
+      brandName = brand.name;
     }
     if (settingsRes.success && settingsRes.settings) {
       const s = settingsRes.settings as Settings;