fix(frontend): 添加缺失的 lastDayHistory 字段到 runtimeStore

修复 App.jsx 中使用不存在的 store 字段导致的潜在运行时错误。

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/store/runtimeStore.js

@@ -87,4 +87,8 @@ export const useRuntimeStore = create((set) => ({
   isRuntimeConfigSaving: false,
   setRuntimeConfigFeedback: (runtimeConfigFeedback) => set({ runtimeConfigFeedback }),
   setIsRuntimeConfigSaving: (isRuntimeConfigSaving) => set({ isRuntimeConfigSaving }),
+
+  // Last day history (for replay)
+  lastDayHistory: [],
+  setLastDayHistory: (lastDayHistory) => set({ lastDayHistory }),
 }));