feat: initial commit — storefront, convex backend, and shared packages

Completes the first milestone of The Pet Loft ecommerce platform:
- apps/storefront: full customer-facing Next.js app with HeroUI (cart,
  checkout, orders, wishlist, product detail, shop, search, auth)
- convex/: serverless backend with schema, queries, mutations, actions,
  HTTP routes, Stripe/Shippo integrations, and co-located tests
- packages/types, packages/utils, packages/convex: shared workspace packages

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/storefront/src/components/layout/BrandLogo.tsx

@@ -0,0 +1,32 @@
+import Image from "next/image";
+import Link from "next/link";
+
+interface BrandLogoProps {
+  size?: number;
+  textClassName?: string;
+}
+
+export function BrandLogo({ size = 28, textClassName }: BrandLogoProps) {
+  return (
+    <Link href="/" className="flex shrink-0 items-center gap-2">
+      <Image
+        src="/branding/logo.svg"
+        alt=""
+        width={size}
+        height={size}
+        className="shrink-0"
+        priority
+      />
+      <span
+        className={
+          textClassName ??
+          "font-bold font-[family-name:var(--font-fraunces)] text-2xl tracking-tight text-[#236f6b]"
+        }
+      >
+        <span className="font-medium lowercase">the</span>{" "}
+        <span className="">Pet</span>
+        <span className="text-[#f4a13a]"> Loft</span>
+      </span>
+    </Link>
+  );
+}