Add reference design images, point task.json at relative paths

tasks/c36/task.json

@@ -15,7 +15,7 @@
  ],
  "domain": "电商",
  "seed_meta": {
-  "ref_image_src": null
+  "ref_image_src": "prototypes/reference.jpg"
  },
  "title": "CREDITGUIDE.DE 贷款对比落地页：复刻 + 真实报价数据 + 申请向导 + 布局重排 + 夜间模式",
  "milestones": [