fix(byse): poll file list when response has empty filecode

User reported uploads appearing on the byse dashboard (2+ GB MKV,
Server #262, status OK) even though the app marked them failed. The
byse API sometimes replies with msg=OK + files:[{filecode:"",
status:"Not video file format"}] — a misleading response where the
file is actually being accepted and gets its filecode assigned
asynchronously.

  - Before the upload POST, snapshot the current /api/file/list to
    know what was already there.
  - If parseByseResult returns an empty filecode (or throws a
    fileRejected error), poll /api/file/list up to 15 × 2s looking
    for a new file_code matching the uploaded filename (case/punct
    normalized, extension stripped).
  - If matched, return the real download/embed URLs and let the
    upload complete as successful. Only throw the parser's error
    if polling also finds nothing.

lib/hosters.js

@@ -369,10 +369,73 @@ async function getUploadServer(hosterName, hosterConfig, apiKey, signal) {
   throw new Error('Kein Upload-Server erhalten. API-Key pruefen.');
 }
 
+async function _fetchByseFileList(apiKey, signal) {
+  // Byse's file-list endpoint. Returns up to 100 most-recent files — enough
+  // to match the upload we just did against what the server has. The API
+  // shape is typical XFS: { status, msg, result: { files: [...] } } or
+  // { status, msg, files: [...] }.
+  const url = `https://api.byse.sx/api/file/list?key=${encodeURIComponent(apiKey)}&per_page=100&sort=date&order=desc`;
+  try {
+    const { body, statusCode } = await request(url, {
+      method: 'GET', signal,
+      headers: { 'Accept': 'application/json', 'User-Agent': 'multi-hoster-uploader/1.1' },
+      headersTimeout: 30_000, bodyTimeout: 30_000
+    });
+    const text = await body.text();
+    if (statusCode < 200 || statusCode >= 300) return [];
+    const data = JSON.parse(text);
+    const src = Array.isArray(data.files) ? data.files
+      : (data.result && Array.isArray(data.result.files) ? data.result.files
+        : (Array.isArray(data.result) ? data.result : []));
+    return src.map(f => ({
+      file_code: String(f.file_code || f.filecode || '').trim(),
+      file_name: String(f.title || f.name || f.file_name || '').trim()
+    })).filter(f => f.file_code);
+  } catch {
+    return [];
+  }
+}
+
+function _normalizeFileTitle(s) {
+  return String(s || '').toLowerCase().replace(/\.[a-z0-9]+$/i, '').replace(/[^a-z0-9]+/g, '');
+}
+
+async function _resolveByseUploadByName(apiKey, fileName, baselineCodes, signal) {
+  const expected = _normalizeFileTitle(fileName);
+  const POLL_ATTEMPTS = 15;
+  const POLL_DELAY_MS = 2000;
+  for (let i = 0; i < POLL_ATTEMPTS; i++) {
+    if (signal && signal.aborted) return null;
+    const list = await _fetchByseFileList(apiKey, signal);
+    const newFiles = list.filter(f => !baselineCodes.has(f.file_code));
+    // Prefer exact filename match (ignoring case/punctuation/extension)
+    const match = newFiles.find(f => _normalizeFileTitle(f.file_name) === expected)
+      || (newFiles.length === 1 ? newFiles[0] : null);
+    if (match) {
+      return {
+        download_url: `https://byse.sx/d/${match.file_code}`,
+        embed_url: `https://byse.sx/e/${match.file_code}`,
+        file_code: match.file_code
+      };
+    }
+    if (i < POLL_ATTEMPTS - 1) await sleep(POLL_DELAY_MS, signal);
+  }
+  return null;
+}
+
 async function uploadFile(hosterName, filePath, apiKey, onProgress, signal, throttle) {
   const config = HOSTER_CONFIGS[hosterName];
   if (!config) throw new Error(`Unbekannter Hoster: ${hosterName}`);
 
+  // For byse: snapshot the current file-code list so the post-upload poller
+  // can identify new arrivals even when the initial POST response has an
+  // empty filecode.
+  let byseBaseline = null;
+  if (hosterName === 'byse.sx') {
+    const baseline = await _fetchByseFileList(apiKey, signal);
+    byseBaseline = new Set(baseline.map(f => f.file_code));
+  }
+
   // Step 1: Get upload server
   const uploadUrl = await getUploadServer(hosterName, config, apiKey, signal);
 
@@ -419,11 +482,30 @@ async function uploadFile(hosterName, filePath, apiKey, onProgress, signal, thro
     throw new Error(payload.msg || payload.message || JSON.stringify(payload));
   }
 
-  const result = config.parseResult(payload);
+  let result = null;
-  if (result?.file_code || result?.download_url || result?.embed_url) {
+  let parseErr = null;
+  try {
+    result = config.parseResult(payload);
+  } catch (err) {
+    parseErr = err;
+  }
+  if (result && (result.file_code || result.download_url || result.embed_url)) {
     return result;
   }
 
+  // Byse-specific async handling: server accepts the file but responds with
+  // filecode="" + misleading status ("Not video file format"). The file shows
+  // up in the account shortly after — poll the list to claim it. User observed
+  // this with 2+ GB MKV uploads that appeared as "OK" on the byse dashboard
+  // even after our uploader gave up.
+  if (hosterName === 'byse.sx' && byseBaseline) {
+    const fileName = path.basename(filePath);
+    const polled = await _resolveByseUploadByName(apiKey, fileName, byseBaseline, signal);
+    if (polled) return polled;
+  }
+
+  if (parseErr) throw parseErr;
+
   if (payload.success === false) {
     throw new Error(payload.msg || payload.message || `Upload zu ${hosterName} wurde vom Server abgelehnt.`);
   }