優化門市叫貨流程：實作庫存預扣機制、鎖定自動產生的調撥單明細、修復自動販賣機貨道數量連動 Bug 及狀態同步問題

database/migrations/tenant/2026_02_25_162728_add_reserved_quantity_to_inventories_table.php

@@ -0,0 +1,28 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('inventories', function (Blueprint $table) {
+            $table->decimal('reserved_quantity', 12, 4)->default(0)->after('quantity')->comment('預留/鎖定庫存數量');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('inventories', function (Blueprint $table) {
+            $table->dropColumn('reserved_quantity');
+        });
+    }
+};