feat: basic layout and pages

- add basic layout with sidebar and main container
- add three menus in sidebar
- add people form page for post people
- add text and image input for recognize people info
- add people table page for show peoples

src/components/HintText.tsx

@@ -0,0 +1,12 @@
+import React from 'react';
+import './HintText.css';
+
+const HintText: React.FC = () => {
+  return (
+    <div className="hint-text">
+      提示：支持输入多行文本与上传图片。按 Enter 发送，Shift+Enter 换行。
+    </div>
+  );
+};
+
+export default HintText;