refactor(react19): replace Context.Provider with Context value={}

- 升级 6 个文件的 Context 语法为 React 19 标准
- ThemeProviderContext, ChartContext, AnimationContext, TourContext, AssetStoreContext, RestartContext
- 构建验证通过
- 功能完全等价

dashboard/src/components/asset-provider.tsx

@@ -52,7 +52,7 @@ export function AssetStoreProvider({ children }: AssetStoreProviderProps) {
     }
   }, [])
 
-  return <AssetStoreContext.Provider value={value}>{children}</AssetStoreContext.Provider>
+  return <AssetStoreContext value={value}>{children}</AssetStoreContext>
 }
 
 export function useAssetStore() {