feat(integration): 完善外部 API 對接邏輯與安全性

1. 新增 API Rate Limiting (每分鐘 60 次)
2. 實作 ProductServiceInterface 與 findOrCreateWarehouseByName 解決跨模組耦合問題
3. 強化 OrderSync API 驗證 (price 欄位限制最小 0、payment_method 加上允許白名單)
4. 實作 OrderSync API 冪等性處理，重複訂單直接回傳現有資訊
5. 修正 ProductSync API 同步邏輯，每次同步皆會更新產品分類與單位
6. 完善 integration API 對接手冊內容與 UI 排版

resources/js/Pages/System/Manual/Index.tsx

@@ -130,7 +130,8 @@ export default function ManualIndex({ toc, currentSlug, content }: Props) {
                             #manual-article blockquote { margin: 0.75rem 0 !important; padding: 0.25rem 1rem !important; border-left: 4px solid var(--primary-main); background: #f8fafc; border-radius: 0 4px 4px 0; }
                             #manual-article img { margin: 1rem 0 !important; border-radius: 8px; box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1); }
                             #manual-article code { padding: 0.1rem 0.3rem; background: #e6f7f3; color: #018a6a; border-radius: 4px; font-size: 0.85em; font-family: ui-monospace, monospace; }
-                            #manual-article pre { margin: 0.75rem 0 !important; padding: 0.75rem !important; background: #1e293b; color: #f8fafc; border-radius: 8px; overflow-x: auto; }
+                            #manual-article pre { margin: 0.75rem 0 !important; padding: 1rem !important; background: #f8fafc; color: #334155; border: 1px solid #e2e8f0; border-radius: 8px; overflow-x: auto; box-shadow: inset 0 1px 2px rgba(0,0,0,0.02); }
+                            #manual-article pre code { background: transparent; padding: 0; color: inherit; font-size: 13.5px; }
                         `}} />
                         <div className="max-w-4xl mx-auto p-4 md:p-10 lg:p-12">
                             <article id="manual-article" className="prose prose-slate max-w-none">