feat: 适配 kimi-code 0.41.0 —— 移除 file_history 镜像 + 守卫文案更新

- file_history flag 上游已移除（turn-level file history 恒开）：
  从 EXPERIMENTAL_FLAGS / env 探测 / FLAG_LABELS / i18n 全链路删除，
  清单回至 9 个；用户 config 残留键被上游静默忽略
- 危险命令守卫行为更新：auto 模式自 0.41.0 起不再拦截危险命令，
  仅 Manual/YOLO 强制询问——开关描述文案（中英）与类型注释同步

src/components/SubagentSettingsPage.tsx

@@ -58,7 +58,6 @@ const FLAG_LABELS: Record<string, { name: TranslationKey; desc: TranslationKey }
   },
   "remote-control": { name: "flagRemoteControl", desc: "flagRemoteControlDesc" },
   search_worker: { name: "flagSearchWorker", desc: "flagSearchWorkerDesc" },
-  file_history: { name: "flagFileHistory", desc: "flagFileHistoryDesc" },
 };
 
 /** Validation-error i18n key per engine rule, for the pre-write self-check. */