chore(backlog): 记录 g157 完成

.ua/backlog.json

@@ -1619,7 +1619,7 @@
       "motivation": "令牌层早就支持 [data-theme=dark]，但配方里没有任何一条说清「怎么切、初值怎么定、原生控件为何仍是白底」，实践只能靠翻令牌表猜。",
       "acceptance": "recipes.md 新增配方 10（切 data-theme + 同步 color-scheme + 初值先读 localStorage），verify 的配方结构校验通过，llms-full 与 MCP get_recipe 10 可取到骨架。",
       "notes": "",
-      "status": "open"
+      "status": "done"
     }
   ]
 }

.ua/iterations.log

@@ -201,3 +201,4 @@
 {"ts":"2026-10-26T15:54:06+08:00","id":"g154","result":"done","commit":"ab758ab","summary":"MCP search_components 返回组件级命中"}
 {"ts":"2026-10-26T15:55:14+08:00","id":"g155","result":"done","commit":"a3ece11","summary":"llms.txt 输出配方目录，修正 MCP 工具描述"}
 {"ts":"2026-10-26T15:55:38+08:00","id":"g156","result":"done","commit":"bbebb70","summary":"ua tokens <子串> 过滤令牌"}
+{"ts":"2026-10-26T15:56:57+08:00","id":"g157","result":"done","commit":"c2412fb","summary":"新增配方 10：暗色主题切换与 color-scheme 同步"}