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>

config/cors.php

@@ -0,0 +1,19 @@
+<?php
+
+return [
+    'paths' => ['api/*'],
+
+    'allowed_methods' => ['GET'],
+
+    'allowed_origins' => ['*'],
+
+    'allowed_origins_patterns' => [],
+
+    'allowed_headers' => ['Content-Type', 'Accept'],
+
+    'exposed_headers' => [],
+
+    'max_age' => 86400,
+
+    'supports_credentials' => false,
+];