feat: 添加聊天会话页面，支持会话ID和标题显示，优化会话列表和搜索功能

app/chat/[conversationId].tsx

@@ -0,0 +1,48 @@
+import { Stack, useLocalSearchParams } from "expo-router";
+import { StyleSheet, Text, View } from "react-native";
+
+export default function ChatConversationRoute() {
+  const params = useLocalSearchParams<{ conversationId?: string; title?: string }>();
+
+  return (
+    <View style={styles.screen}>
+      <Stack.Screen options={{ title: params.title || "会话" }} />
+      <View style={styles.card}>
+        <Text selectable style={styles.title}>
+          聊天页骨架
+        </Text>
+        <Text selectable style={styles.subTitle}>
+          会话 ID: {params.conversationId || "-"}
+        </Text>
+      </View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  screen: {
+    alignItems: "center",
+    backgroundColor: "#F7F7F8",
+    flex: 1,
+    justifyContent: "center",
+    paddingHorizontal: 20,
+  },
+  card: {
+    backgroundColor: "#FFFFFF",
+    borderCurve: "continuous",
+    borderRadius: 20,
+    gap: 8,
+    paddingHorizontal: 18,
+    paddingVertical: 16,
+    width: "100%",
+  },
+  title: {
+    color: "#1F2328",
+    fontSize: 18,
+    fontWeight: "700",
+  },
+  subTitle: {
+    color: "#6C737F",
+    fontSize: 14,
+  },
+});