feat(admin): merge Site Settings and Wishlist into single Configurações panel

Single-wishlist apps no longer need two separate edit sections.
Both siteTitle/homepageSubtext and wishlist fields now save together
in one action from a unified Configurações card.

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

app/api/wishlists/[id]/items/route.ts

@@ -82,6 +82,8 @@ export async function POST(
     const {
       name,
       description,
+      price,
+      currency,
       quantity,
       imageUrl,
       purchaseUrls,
@@ -126,6 +128,8 @@ export async function POST(
         wishlistId: id,
         name,
         description: description || null,
+        price: price != null ? Number(price) : null,
+        currency: currency || 'BRL',
         quantity: quantity || 1,
         imageUrl: imageUrl || null,
         purchaseUrls: purchaseUrls || null,