Contributor credits, SVG prefetch, integrate Xiaomi MiMo from PR #4

- Runs gain a contributor field (GitHub username); the site renders an
  avatar chip linked to their profile next to each run's notes, and CI
  validates the field. All existing runs are attributed.
- SVG variants of a case are prefetched during idle time, so switching
  model tabs swaps images without a network hiccup.
- Xiaomi MiMo v2.5 Pro (Claude Code, max effort) integrated from PR #4
  with both case runs and provenance notes; README registry tables
  updated.

Co-authored-by: DuJiabao <Jiabao.du@Yunzhisun.com>

models/doubao-seed-2-0-pro.json

@@ -9,7 +9,8 @@
       "note": {
         "zh": "使用豆包网页版超能模式，首次输出了 png 图片，经提醒后生成 svg 代码。",
         "en": "Using Doubao web app (Pro mode), it initially output a PNG image, then generated the SVG code after being reminded."
-      }
+      },
+      "contributor": "LpIuma"
     }
   }
 }