添加标签页布局，创建主页和关于页组件，删除不再使用的索引和模态页

app/(tabs)/_layout.tsx

@@ -0,0 +1,10 @@
+import { Tabs } from 'expo-router';
+
+export default function TabLayout() {
+  return (
+    <Tabs>
+      <Tabs.Screen name="index" options={{ title: 'Home' }} />
+      <Tabs.Screen name="about" options={{ title: 'About' }} />
+    </Tabs>
+  );
+}

app/(tabs)/about.tsx

@@ -0,0 +1,5 @@
+import { Text } from "react-native";
+
+export default function AboutRoute() {
+  return <Text>About Route</Text>;
+}

app/(tabs)/index.tsx

@@ -0,0 +1,5 @@
+import { Text } from "react-native";
+
+export default function IndexRoute() {
+  return <Text>Index Route</Text>;
+}

app/_layout.tsx

@@ -16,11 +16,7 @@ export default function RootLayout() {
     <AppBootstrapProvider>
       <ThemeProvider value={colorScheme === "dark" ? DarkTheme : DefaultTheme}>
         <Stack>
-          <Stack.Screen name="index" options={{ headerShown: false }} />
+          <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
-          <Stack.Screen
-            name="modal"
-            options={{ presentation: "modal", title: "Modal" }}
-          />
         </Stack>
         <StatusBar style="auto" />
       </ThemeProvider>

app/index.tsx

@@ -1,5 +0,0 @@
-import { HomeScreen } from "@/features/home/screens/home-screen";
-
-export default function IndexRoute() {
-  return <HomeScreen />;
-}

app/modal.tsx

@@ -1,5 +0,0 @@
-import { ModalScreen } from "@/features/system/screens/modal-screen";
-
-export default function ModalRoute() {
-  return <ModalScreen />;
-}