feat:下载管理页面，集成分享功能

utils/lanServer.ts

@@ -0,0 +1,26 @@
+import StaticServer from '@dr.pogodin/react-native-static-server';
+import * as FileSystem from 'expo-file-system/legacy';
+import * as Network from 'expo-network';
+
+const PORT = 18080;
+let server: StaticServer | null = null;
+
+export async function startLanServer(): Promise<string> {
+  if (server) await server.stop();
+  const root = FileSystem.documentDirectory!.replace('file://', '');
+  server = new StaticServer({ fileDir: root, port: PORT, nonLocal: true });
+  await server.start();
+  const ip = await Network.getIpAddressAsync();
+  return `http://${ip}:${PORT}`;
+}
+
+export async function stopLanServer(): Promise<void> {
+  if (server) {
+    await server.stop();
+    server = null;
+  }
+}
+
+export function buildVideoUrl(baseUrl: string, bvid: string, qn: number): string {
+  return `${baseUrl}/${bvid}_${qn}.mp4`;
+}