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-3-5-flash.json

@@ -9,21 +9,24 @@
       "note": {
         "zh": "通过 AntiGravity 生成（thinking effort: high）；本页为修复版（仅改 1 行）。问题：16 张贴图按「上为原点」的行序画进 4×4 图集，UV 坐标表也按同一行序编写，但 CanvasTexture 默认 flipY=true 把采样行上下镜像（第 r 行实际采到第 3-r 行）。修复前：草地顶面显示成紫水晶、侧面采到带透明孔洞的传送门/树叶贴图，配合 alphaTest 出现大量「透明方块」，放置的方块贴图与名称完全对不上。原因：flipY 与图集行序约定不一致。加上 flipY=false 后行序对齐，地形与方块全部正常。",
         "en": "Generated via AntiGravity (thinking effort: high); fixed build (1 line changed). Bug: 16 tiles drawn into a 4x4 atlas with top-origin rows, and the UV table uses the same convention, but CanvasTexture's default flipY=true mirrors the rows on sampling (row r actually reads row 3-r). Before the fix: grass tops rendered as purple crystal, sides sampled the portal/leaves tiles with alpha holes — hence the many \"transparent blocks\" — and placed blocks never matched their names. Cause: flipY disagreeing with the atlas row convention. With flipY=false everything lines up."
-      }
+      },
+      "contributor": "Nagi-ovo"
     },
     "pelican-cycling": [
       {
         "note": {
           "zh": "在 Google AI Studio 以 Gemini 3.5 Flash High（最高思考强度）一次生成。",
           "en": "Generated in Google AI Studio on Gemini 3.5 Flash 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"
       }
     ]
   }