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/Vendor/Index.tsx

@@ -13,20 +13,20 @@ import Pagination from "@/Components/shared/Pagination";
 import { SearchableSelect } from "@/Components/ui/searchable-select";
 
 export interface Vendor {
-    id: number;
+    id: string;
     code: string;
     name: string;
-    short_name?: string;
-    tax_id?: string;
+    shortName?: string;
+    taxId?: string;
     owner?: string;
-    contact_name?: string;
+    contactName?: string;
     tel?: string;
     phone?: string;
     email?: string;
     address?: string;
     remark?: string;
-    created_at: string;
-    updated_at: string;
+    createdAt?: string;
+    updatedAt?: string;
 }
 
 interface PageProps {
@@ -126,7 +126,7 @@ export default function VendorManagement({ vendors, filters }: PageProps) {
         router.get(route("vendors.show", vendor.id));
     };
 
-    const handleDeleteVendor = (id: number) => {
+    const handleDeleteVendor = (id: string) => {
         router.delete(route('vendors.destroy', id));
     };