fix(commerce-backend): corregir tipo de callback en location_levels.find

TS2769: la anotacion explicita {location_id: string} no calzaba con el
tipo Maybe<InventoryLevel> que infiere query.graph para location_levels.
Se quita la anotacion y se deja inferir, con optional chaining.

workloads/commerce-backend/src/api/admin/inventory-panel/route.ts

@@ -49,7 +49,7 @@ export async function GET(req: MedusaRequest, res: MedusaResponse) {
     const variant = product.variants?.[0];
     const inventoryItem = variant?.inventory_items?.[0];
     const level = inventoryItem?.inventory?.location_levels?.find(
-      (level: { location_id: string }) => level.location_id === locationId,
+      (candidate) => candidate?.location_id === locationId,
     );
     return {
       productId: product.id,
@@ -131,7 +131,7 @@ export async function POST(req: MedusaRequest<PanelUpdateBody>, res: MedusaRespo
     }
     if (typeof quantity === "number" && inventoryItemId) {
       const level = inventoryItem?.inventory?.location_levels?.find(
-        (level: { location_id: string }) => level.location_id === locationId,
+        (candidate) => candidate?.location_id === locationId,
       );
       await updateInventoryLevelsWorkflow(req.scope).run({
         input: {