fix(storefront): align store actions with actual DB schema

Reviewer caught three runtime breakages that the prior commit would
have introduced (the legacy supabase shim masked them by returning
null):

1. **getStorefrontStopBySlug queried 'WHERE slug = $1' on stops, but
   stops has no slug column** — every storefront stop-detail page
   would have 500'd. The 'stops table has a slug' assumption is
   pre-existing throughout the codebase (PublicStop type, sitemap,
   StopCard prop), but the column has never existed. Fix: switch the
   route param to the stop's UUID (id). Rename folder [slug] → [id]
   for honesty. Update StopCard prop and the two stops-list links to
   pass stop.id instead of stop.slug. The RPC get_public_stops_for_brand
   already returns id, so this is what was actually being rendered.

2. **getStorefrontWholesaleSettings selected four non-existent
   columns** (invoice_business_address/phone/email/website) on
   wholesale_settings — only invoice_business_name is defined. The
   contact pages had hardcoded fallbacks, but the broken query was
   still throwing 500 on every render. Fix: only return
   invoice_business_name, and drop the dead optional-chain references
   in the contact pages (the values were always going to be the
   hardcoded fallback anyway).

3. **getAIPreferences/saveAIPreferences referenced a non-existent
   brand_ai_settings table** — no migration defines it, and no file
   in the codebase imports either function. Deleted the whole
   preferences.ts module (dead code that would have 500'd the moment
   anyone wired it up).

4. **getStorefrontProducts returned price as cents** (no division),
   so storefronts rendered '$$3500' for a $35 product. Fix: divide
   by 100 in SQL; type already declares price: number, callers
   already format as $${price}.

Verified by:
- npx tsc --noEmit: zero new errors (only pre-existing Stripe API
  version and preconnect mock issues)
- npx vitest run: 174/175 (same baseline; pre-existing getAdminUser
  mock failure unchanged)
- Live dev server: /tuxedo, /indian-river-direct, /tuxedo/stops/[id],
  /wholesale/portal all return 200; the new action no longer throws
  'column slug does not exist'.

src/app/tuxedo/contact/ContactClientPage.tsx

@@ -9,10 +9,6 @@ import { getStorefrontWholesaleSettings } from "@/actions/storefront";
 
 type BrandSettings = {
   invoice_business_name: string | null;
-  invoice_business_address: string | null;
-  invoice_business_phone: string | null;
-  invoice_business_email: string | null;
-  invoice_business_website: string | null;
 };
 
 type FormState = {
@@ -72,7 +68,7 @@ export default function TuxedoContactPage() {
                 </div>
                 <h3 className="text-base font-bold text-stone-950 mb-3">Farm Address</h3>
                 <p className="text-sm text-stone-500 leading-relaxed">
-                  {brandSettings?.invoice_business_address ?? "59751 David Road, Olathe, CO 81425"}
+                  59751 David Road, Olathe, CO 81425
                 </p>
               </div>
               <div className="rounded-3xl bg-white p-8 shadow-sm ring-1 ring-stone-200/60 text-center">
@@ -96,8 +92,8 @@ export default function TuxedoContactPage() {
                   </svg>
                 </div>
                 <h3 className="text-base font-bold text-stone-950 mb-3">Email</h3>
-                <a href={`mailto:${brandSettings?.invoice_business_email ?? "orders@tuxedocorn.com"}`} className="text-sm text-stone-500 hover:text-emerald-700 transition-colors">
-                  {brandSettings?.invoice_business_email ?? "orders@tuxedocorn.com"}
+                <a href="mailto:orders@tuxedocorn.com" className="text-sm text-stone-500 hover:text-emerald-700 transition-colors">
+                  orders@tuxedocorn.com
                 </a>
               </div>
             </div>