fix(canvas templates api): remove unnecessary login check for category list

移除了画布模板分类列表接口的登录校验逻辑，不再强制携带认证头请求上游服务

src/app/api/canvas-templates/categories/route.ts

@@ -1,4 +1,3 @@
-import { requireLogin } from "@/app/api/_auth";
 import { NextRequest, NextResponse } from "next/server";
 
 const UPSTREAM_CATEGORY_LIST_PATH = "/api_client/canvas/template/category/list";
@@ -22,12 +21,8 @@ export async function GET(request: NextRequest) {
     "keyword",
     request.nextUrl.searchParams.get("keyword") || "",
   );
-  const { token } = requireLogin(request);
   const response = await fetch(upstreamUrl, {
     method: "GET",
-    headers: {
-      authorization: `Bearer ${token}`,
-    },
   });
   const body = await response.text();