Update LOT API to use nested batch_origin_entries structure

Each spice now returns an `origins` array (was single `origin` object) with
supplier and farmer resolved from the new entries relation, not flat columns.

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

app/Http/Controllers/Api/LotController.php

@@ -16,7 +16,8 @@ class LotController extends Controller
             'size.packing',
             'recipe.spices',
             'origins.spice',
-            'origins.supplier',
+            'origins.entries.supplier',
+            'origins.entries.farmer',
         ])->where('lot_number', $lotNumber)->first();
 
         if (! $batch) {