feat: implement task management store with IPC integration

- Added a new task store in `src-react/stores/task.ts` to manage tasks and their statuses.
- Implemented functions for creating, executing, and retrying tasks, along with handling task progress and completion.
- Introduced persistence for tasks using IPC.
- Created utility functions for normalizing room types and building subtasks.
- Added a new CSS file for global styles in `src-react/styles.css`.
- Created runtime types in `src-react/types/runtime.ts` and exported them.
- Updated the main entry points for Vue and React applications to support dynamic framework loading.
- Refactored chat model interfaces and utility functions into `src/shared/chat-model.ts`.
- Updated TypeScript configuration to include paths for React components and types.
- Enhanced Vite configuration to support both Vue and React frameworks.

src-react/pages/Agents/index.tsx

@@ -0,0 +1,16 @@
+import PagePlaceholder from '../PagePlaceholder';
+
+export default function AgentsPage() {
+  return (
+    <PagePlaceholder
+      tag="模型"
+      title="模型管理"
+      subtitle="保持与当前 Vue 页面一致的视觉外壳，后续再替换真实内容。"
+      description="这一页先承接提供方、模型配置和相关运行状态的 React 壳层，不重新设计布局。"
+      stats={[
+        { label: '页面状态', value: '占位壳' },
+        { label: '迁移策略', value: '沿用现有 UI' },
+      ]}
+    />
+  );
+}