Add delivery_note field to products for planned delivery info

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

database/migrations/2024_01_01_000023_add_delivery_note_to_products.php

@@ -0,0 +1,18 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration {
+    public function up(): void {
+        Schema::table('products', function (Blueprint $table) {
+            $table->string('delivery_note')->nullable()->after('track_stock');
+        });
+    }
+    public function down(): void {
+        Schema::table('products', function (Blueprint $table) {
+            $table->dropColumn('delivery_note');
+        });
+    }
+};