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/gemini-3-1-pro.json

@@ -9,21 +9,24 @@
       "note": {
         "zh": "通过 AntiGravity 生成（thinking effort: high）；一次生成，未发现需要修复的问题，原样展示。",
         "en": "Generated via AntiGravity (thinking effort: high); one shot, no fixes needed — shown as-is."
-      }
+      },
+      "contributor": "Nagi-ovo"
     },
     "pelican-cycling": [
       {
         "note": {
           "zh": "在 Google AI Studio 以 Gemini 3.1 Pro Preview High（最高思考强度）一次生成。",
           "en": "Generated in Google AI Studio on Gemini 3.1 Pro Preview High (max thinking effort) in one shot."
-        }
+        },
+        "contributor": "LpIuma"
       },
       {
         "file": "pelican-cycling-2.svg",
         "note": {
           "zh": "由社区 PR #3（Codex 工作流）提交，提交者未注明运行环境与思考档位。",
           "en": "Contributed via community PR #3 (a Codex workflow); the submitter did not specify the runtime or effort level."
-        }
+        },
+        "contributor": "XA2333"
       }
     ]
   }