重构项目结构，删除未使用的组件和文件，添加主页和模态页实现

features/home/screens/home-screen.tsx

@@ -0,0 +1,38 @@
+import { Link } from "expo-router";
+import { StyleSheet, Text, View } from "react-native";
+
+export function HomeScreen() {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.title}>lamp</Text>
+      <Text style={styles.subtitle}>OpenIM powered messaging workspace</Text>
+      <Link href="/modal" style={styles.link}>
+        Open modal preview
+      </Link>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    justifyContent: "center",
+    alignItems: "center",
+    gap: 10,
+    padding: 24,
+  },
+  title: {
+    fontSize: 32,
+    fontWeight: "700",
+    letterSpacing: 0.5,
+  },
+  subtitle: {
+    fontSize: 15,
+    color: "#5c6169",
+  },
+  link: {
+    marginTop: 8,
+    fontSize: 16,
+    fontWeight: "600",
+  },
+});