feat(catalog): add product fulfillment flags and auto SKU

Enable online/cross-city/on-site purchase switches with trade gates, HQ and proxy UI, and server-generated DK SKUs.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/mini-user/src/styles/product-detail.css

@@ -301,6 +301,25 @@
   color: var(--color-on-surface-variant);
 }
 
+.product-detail-pickup-btn {
+  flex: 1;
+  height: 48px;
+  border-radius: 999px;
+  background: transparent;
+  border: 1px solid var(--color-heritage-red);
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-sizing: border-box;
+}
+
+.product-detail-pickup-btn-text {
+  color: var(--color-heritage-red);
+  font-family: var(--font-headline);
+  font-size: 15px;
+  font-weight: 700;
+}
+
 .product-detail-buy-btn {
   flex: 1;
   height: 48px;
@@ -312,6 +331,12 @@
   box-shadow: 0 8px 24px rgba(166, 29, 36, 0.2);
 }
 
+.product-detail-buy-btn--disabled {
+  background: #c4c4c4;
+  box-shadow: none;
+  pointer-events: none;
+}
+
 .product-detail-buy-btn-text {
   color: #fff;
   font-family: var(--font-headline);