feat: 修正庫存與撥補單邏輯並整合文件

1. 修復倉庫統計數據加總與樣式。
2. 修正可用庫存計算邏輯（排除不可銷售倉庫）。
3. 撥補單商品列表加入批號與效期顯示。
4. 修正撥補單儲存邏輯以支援精確批號轉移。
5. 整合 FEATURES.md 至 README.md。

resources/js/Pages/Warehouse/Index.tsx

@@ -13,6 +13,7 @@ import Pagination from "@/Components/shared/Pagination";
 import { toast } from "sonner";
 import { getBreadcrumbs } from "@/utils/breadcrumb";
 import { Can } from "@/Components/Permission/Can";
+import { Card, CardContent } from "@/Components/ui/card";
 
 interface PageProps {
     warehouses: {
@@ -22,12 +23,16 @@ interface PageProps {
         last_page: number;
         total: number;
     };
+    totals: {
+        available_stock: number;
+        book_stock: number;
+    };
     filters: {
         search?: string;
     };
 }
 
-export default function WarehouseIndex({ warehouses, filters }: PageProps) {
+export default function WarehouseIndex({ warehouses, totals, filters }: PageProps) {
     // 篩選狀態
     const [searchTerm, setSearchTerm] = useState(filters.search || "");
 
@@ -119,6 +124,31 @@ export default function WarehouseIndex({ warehouses, filters }: PageProps) {
                     </p>
                 </div>
 
+                {/* 統計區塊 */}
+                <div className="grid grid-cols-1 md:grid-cols-2 gap-6 mb-6">
+                    <Card className="shadow-sm">
+                        <CardContent className="p-6">
+                            <div className="flex flex-col">
+                                <span className="text-sm font-medium text-gray-500 mb-1">可用庫存總計</span>
+                                <span className="text-3xl font-bold text-blue-600">
+                                    {totals.available_stock.toLocaleString()}
+                                </span>
+                            </div>
+                        </CardContent>
+                    </Card>
+
+                    <Card className="shadow-sm">
+                        <CardContent className="p-6">
+                            <div className="flex flex-col">
+                                <span className="text-sm font-medium text-gray-500 mb-1">帳面庫存總計</span>
+                                <span className="text-3xl font-bold text-gray-700">
+                                    {totals.book_stock.toLocaleString()}
+                                </span>
+                            </div>
+                        </CardContent>
+                    </Card>
+                </div>
+
                 {/* 工具列 */}
                 <div className="bg-white rounded-lg shadow-sm border p-4 mb-6">
                     <div className="flex flex-col md:flex-row gap-4 items-start md:items-center justify-between">