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).

next.config.ts

@@ -124,6 +124,17 @@ const nextConfig: NextConfig = {
       { source: "/admin/orders/:id", destination: "/admin/v2/orders/:id", permanent: false },
       { source: "/admin/stops", destination: "/admin/v2/stops", permanent: false },
       { source: "/admin/products", destination: "/admin/v2/products", permanent: false },
+      // v1 admin pages that hit the dead supabase shim. There are no v2
+      // equivalents yet (reports / taxes / settings sub-pages are still
+      // TBD on the v2 surface), so they redirect to the v2 dashboard
+      // for now. Once those modules ship on v2, the redirects can be
+      // tightened to point at the new pages.
+      { source: "/admin/products/:id", destination: "/admin/v2/products", permanent: false },
+      { source: "/admin/reports", destination: "/admin/v2", permanent: false },
+      { source: "/admin/taxes", destination: "/admin/v2", permanent: false },
+      { source: "/admin/settings/shipping", destination: "/admin/settings", permanent: false },
+      { source: "/admin/settings/integrations", destination: "/admin/settings", permanent: false },
+      { source: "/admin/settings/billing", destination: "/admin/settings", permanent: false },
     ];
   },