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/components/admin/SquareSyncWidget.tsx

@@ -24,13 +24,9 @@ export default function SquareSyncWidget({ brandId }: Props) {
   const [queueCount, setQueueCount] = useState(0);
 
   const checkQueueCount = useCallback(async () => {
-    const { supabase } = await import("@/lib/supabase");
-    const result = await supabase
-      .from("square_sync_queue")
-      .select("*", { count: "exact", head: true })
-      .eq("brand_id", brandId)
-      .in("status", ["pending"]) as unknown as { count: number | null };
-    setQueueCount(result.count ?? 0);
+    const { getSquareQueueCount } = await import("@/actions/square-sync-ui");
+    const count = await getSquareQueueCount(brandId);
+    setQueueCount(count);
   }, [brandId]);
 
   useEffect(() => {