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

tasks/c24/task.json

@@ -14,7 +14,7 @@
  ],
  "domain": "社区表单",
  "seed_meta": {
-  "ref_image_src": null
+  "ref_image_src": "prototypes/reference.jpg"
  },
  "title": "Castello Monaci 婚礼庄园官网：复刻 · 表单交互 · 酒红换肤 · 预算速算区",
  "milestones": [