feat(admin): sortable product list column headers

Click a column header (名称/品牌/条码/品类/状态/质量分) to sort asc, click
again for desc, and a third time to clear back to the default
most-recently-updated order. Sort key/direction are whitelisted server-side.

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

admin-frontend/src/api.ts

@@ -51,14 +51,23 @@ export const api = {
       body: JSON.stringify({ username, password }),
     }),
   me: () => request<{ username: string }>("/me"),
-  listProducts: (q: string, page: number, size: number) =>
+  listProducts: (
+    q: string,
+    page: number,
+    size: number,
+    sort?: string,
+    order?: string,
+  ) =>
     request<{
       items: import("./types").ProductRow[];
       page: number;
       size: number;
       total: number;
       completeness_fields: string[];
-    }>(`/products?q=${encodeURIComponent(q)}&page=${page}&size=${size}`),
+    }>(
+      `/products?q=${encodeURIComponent(q)}&page=${page}&size=${size}` +
+        (sort ? `&sort=${sort}&order=${order || "asc"}` : ""),
+    ),
   getProduct: (id: string) =>
     request<import("./types").ProductDetail>(`/products/${id}`),
   createProduct: (body: unknown) =>