添加登录和后端校验

完成后端设计（未在本仓库体现），通过安全的手段完成了登录鉴权

src/app.tsx

@@ -0,0 +1,26 @@
+import { Component, PropsWithChildren } from 'react'
+import { ThemeProvider } from './context/ThemeContext'
+import { getTheme, resolveTheme } from './utils/store'
+import { applyPageBackground } from './utils/themeBackground'
+import './app.scss'
+
+class App extends Component<PropsWithChildren> {
+  componentDidMount() {
+    // 启动最早时机同步页面背景，避免自定义导航区在深色模式下闪白
+    applyPageBackground(resolveTheme(getTheme()))
+  }
+
+  componentDidShow() {}
+
+  componentDidHide() {}
+
+  render() {
+    return (
+      <ThemeProvider>
+        {this.props.children}
+      </ThemeProvider>
+    )
+  }
+}
+
+export default App