refactor(storefront): replace supabase shim in storefront pages

The legacy lib/supabase.ts shim returns { data: null } for every query,
which silently broke the tuxedo and indian-river-direct storefronts:
they displayed 'No stops on the calendar just yet' regardless of the
real data in Postgres.

Added src/actions/storefront.ts as a new "use server" module with
typed actions that hit the shared pg pool directly:
  - getStorefrontData(slug) — brand + stops + products in one call
  - getStorefrontStopBySlug(slug) — single stop + its products
  - getStorefrontWholesaleSettings(slug) — public invoice/business info

Updated to use these actions instead of the shim:
  - src/app/tuxedo/page.tsx
  - src/app/tuxedo/stops/[slug]/page.tsx
  - src/app/tuxedo/contact/ContactClientPage.tsx
  - src/app/indian-river-direct/page.tsx
  - src/app/indian-river-direct/stops/[slug]/page.tsx

The shim file itself is still imported by other pages and API routes
that will be migrated in follow-up steps.

src/app/tuxedo/contact/ContactClientPage.tsx

@@ -5,7 +5,7 @@ import Link from "next/link";
 import StorefrontHeader from "@/components/storefront/StorefrontHeader";
 import StorefrontFooter from "@/components/storefront/StorefrontFooter";
 import LayoutContainer from "@/components/layout/LayoutContainer";
-import { supabase } from "@/lib/supabase";
+import { getStorefrontWholesaleSettings } from "@/actions/storefront";
 
 type BrandSettings = {
   invoice_business_name: string | null;
@@ -29,13 +29,8 @@ export default function TuxedoContactPage() {
   const [isSubmitting, setIsSubmitting] = useState(false);
 
   useEffect(() => {
-    const TUXEDO_BRAND_ID = "64294306-5f42-463d-a5e8-2ad6c81a96de";
-    supabase
-      .from("wholesale_settings")
-      .select("invoice_business_name, invoice_business_address, invoice_business_phone, invoice_business_email, invoice_business_website")
-      .eq("brand_id", TUXEDO_BRAND_ID)
-      .single()
-      .then(({ data }) => setBrandSettings((data as unknown as BrandSettings) ?? null));
+    getStorefrontWholesaleSettings("tuxedo")
+      .then((data) => setBrandSettings(data as BrandSettings | null));
   }, []);
 
   function handleSubmit(e: React.FormEvent) {