feat(category): add branded icons for contract-address and data-records

Backend zh-CN /api/categories now returns two new categories:
  id=17 slug=contract-address  (合约地址)
  id=18 slug=data-records      (数据收录)

Export the matching gold-tone PNGs from Figma and wire them into
slugToAsset so CategoryIcon serves the branded artwork instead of
falling back to the lucide iconKey (folder / play). en locale still
returns 13 categories, so English users will pick this up once the
backend ships translations for the two new entries.

src/lib/categorySvgSlug.ts

@@ -14,6 +14,8 @@ const slugToAsset: Record<string, string> = {
   "media-coverage": "svg/news-record.svg",
   "academy-video": "png/academy-video.png",
   "acedemy-video": "png/academy-video.png",
+  "contract-address": "png/contract-address.png",
+  "data-records": "png/data-records.png",
   general: "svg/general.svg",
 };