Initial commit: MangaReader iOS App

✨ Features:
- App iOS completa para leer manga sin publicidad
- Scraper con WKWebView para manhwaweb.com
- Sistema de descargas offline
- Lector con zoom y navegación
- Favoritos y progreso de lectura
- Compatible con iOS 15+ y Sideloadly/3uTools

📦 Contenido:
- Backend Node.js con Puppeteer (opcional)
- App iOS con SwiftUI
- Scraper de capítulos e imágenes
- Sistema de almacenamiento local
- Testing completo
- Documentación exhaustiva

🧪 Prueba: Capítulo 789 de One Piece descargado exitosamente
  - 21 páginas descargadas
  - 4.68 MB total
  - URLs verificadas y funcionales

🎉 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/node_modules/axios/lib/helpers/trackStream.js

@@ -0,0 +1,87 @@
+
+export const streamChunk = function* (chunk, chunkSize) {
+  let len = chunk.byteLength;
+
+  if (!chunkSize || len < chunkSize) {
+    yield chunk;
+    return;
+  }
+
+  let pos = 0;
+  let end;
+
+  while (pos < len) {
+    end = pos + chunkSize;
+    yield chunk.slice(pos, end);
+    pos = end;
+  }
+}
+
+export const readBytes = async function* (iterable, chunkSize) {
+  for await (const chunk of readStream(iterable)) {
+    yield* streamChunk(chunk, chunkSize);
+  }
+}
+
+const readStream = async function* (stream) {
+  if (stream[Symbol.asyncIterator]) {
+    yield* stream;
+    return;
+  }
+
+  const reader = stream.getReader();
+  try {
+    for (;;) {
+      const {done, value} = await reader.read();
+      if (done) {
+        break;
+      }
+      yield value;
+    }
+  } finally {
+    await reader.cancel();
+  }
+}
+
+export const trackStream = (stream, chunkSize, onProgress, onFinish) => {
+  const iterator = readBytes(stream, chunkSize);
+
+  let bytes = 0;
+  let done;
+  let _onFinish = (e) => {
+    if (!done) {
+      done = true;
+      onFinish && onFinish(e);
+    }
+  }
+
+  return new ReadableStream({
+    async pull(controller) {
+      try {
+        const {done, value} = await iterator.next();
+
+        if (done) {
+         _onFinish();
+          controller.close();
+          return;
+        }
+
+        let len = value.byteLength;
+        if (onProgress) {
+          let loadedBytes = bytes += len;
+          onProgress(loadedBytes);
+        }
+        controller.enqueue(new Uint8Array(value));
+      } catch (err) {
+        _onFinish(err);
+        throw err;
+      }
+    },
+    cancel(reason) {
+      _onFinish(reason);
+      return iterator.return();
+    }
+  }, {
+    highWaterMark: 2
+  })
+}