Add LOT API v1 endpoint with full batch details

Route changed to /api/v1/{lot_number}. LotResource now includes
packing details, units_produced, quantity_g and recipe version.
CORS config added for public API access. README documents the
endpoint, example response and subdomain setup instructions.

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

routes/api.php

@@ -5,8 +5,8 @@ use App\Http\Controllers\ShopifyWebhookController;
 use App\Http\Middleware\VerifyShopifyWebhook;
 use Illuminate\Support\Facades\Route;
 
-Route::get('/lot/{lot_number}', [LotController::class, 'show'])
-    ->middleware('throttle:30,1')
+Route::get('/v1/{lot_number}', [LotController::class, 'show'])
+    ->middleware('throttle:60,1')
     ->name('api.lot');
 
 Route::post('/webhooks/shopify/orders-paid', [ShopifyWebhookController::class, 'ordersPaid'])