feat(youtube): ses dosyası indirme ve hata yönetimini iyileştir

Sadece ses dosyası indirme özelliğini geliştir ve hata yönetimini güçlendir:

- Ses indirme formatını m4a/mp4/webm opus önceliğiyle optimize et
- İş bazında ayarları destekle ve varsayılan ayarlara geri düş
- Sadece ses indirmeleri için özel extractor argümanları kullan
- yt-dlp hata koduna rağmen medya dosyası bulunursa devam et
- Hem ses hem video dosyalarını tespit eden yeni findYoutubeMediaFile fonksiyonu ekle
- Müzik tespiti mantığını iyileştir ve ses bayrağını dikkate al

server/server.js

@@ -785,8 +785,11 @@ function saveYoutubeSettings({ resolution, onlyAudio }) {
 }
 
 function buildYoutubeFormat({ resolution, onlyAudio }) {
-  if (onlyAudio) return "bestaudio/b";
-  const match = String(resolution || YT_DEFAULT_RESOLUTION).match(/(\\d+)/);
+  if (onlyAudio) {
+    // Tarayıcıda çalınabilir bir ses dosyası (öncelik m4a/mp4/webm opus) indir
+    return "ba[ext=m4a]/ba[ext=mp4]/ba[acodec^=opus]/bestaudio";
+  }
+  const match = String(resolution || YT_DEFAULT_RESOLUTION).match(/(\d+)/);
   const height = match ? Number(match[1]) : 1080;
   const safeHeight = Number.isFinite(height) && height > 0 ? height : 1080;
   return `bestvideo[height<=${safeHeight}]+bestaudio/best[height<=${safeHeight}]`;
@@ -795,7 +798,14 @@ function buildYoutubeFormat({ resolution, onlyAudio }) {
 function launchYoutubeJob(job) {
   const binary = getYtDlpBinary();
   const jsRuntimeArg = process.env.YT_DLP_JS_RUNTIME || "node";
-  const ytSettings = loadYoutubeSettings();
+  const fallbackSettings = loadYoutubeSettings();
+  const ytSettings = {
+    resolution: job?.resolution || fallbackSettings.resolution,
+    onlyAudio:
+      typeof job?.onlyAudio === "boolean"
+        ? job.onlyAudio
+        : fallbackSettings.onlyAudio
+  };
 
   const cookieFile =
     (YT_COOKIES_PATH && fs.existsSync(YT_COOKIES_PATH) && YT_COOKIES_PATH) ||
@@ -803,7 +813,11 @@ function launchYoutubeJob(job) {
 
   const extractorArgValue =
     YT_EXTRACTOR_ARGS ||
-    (cookieFile ? "youtube:player-client=web" : "youtube:player-client=android");
+    (ytSettings.onlyAudio
+      ? "youtube:player-client=web_safari,web,ios,mweb"
+      : cookieFile
+      ? "youtube:player-client=web"
+      : "youtube:player-client=android");
 
   const formatSelector = buildYoutubeFormat(ytSettings);
 
@@ -818,6 +832,17 @@ function launchYoutubeJob(job) {
     jsRuntimeArg,
     "--extractor-args",
     extractorArgValue,
+    ...(ytSettings.onlyAudio
+      ? [
+          "--extract-audio",
+          "--audio-format",
+          "m4a",
+          "--audio-quality",
+          "0",
+          "--remux-audio",
+          "m4a"
+        ]
+      : []),
     ...(cookieFile && fs.existsSync(cookieFile)
       ? ["--cookies", cookieFile]
       : []),
@@ -941,7 +966,8 @@ function updateYoutubeProgress(job, match) {
 
 async function finalizeYoutubeJob(job, exitCode) {
   job.downloadSpeed = 0;
-  if (exitCode !== 0) {
+  const fallbackMedia = findYoutubeMediaFile(job.savePath, Boolean(job.onlyAudio));
+  if (exitCode !== 0 && !fallbackMedia) {
     job.state = "error";
     const tail = job.debug?.logs ? job.debug.logs.slice(-8) : [];
     job.error = `yt-dlp ${exitCode} kodu ile sonlandı`;
@@ -958,6 +984,11 @@ async function finalizeYoutubeJob(job, exitCode) {
     broadcastSnapshot();
     return;
   }
+  if (exitCode !== 0 && fallbackMedia) {
+    console.warn(
+      `⚠️ yt-dlp çıkış kodu ${exitCode} ancak medya bulundu, devam ediliyor: ${fallbackMedia}`
+    );
+  }
 
   try {
     if (job.currentStage && !job.currentStage.done && job.currentStage.totalBytes) {
@@ -966,8 +997,11 @@ async function finalizeYoutubeJob(job, exitCode) {
     }
 
     const infoJson = findYoutubeInfoJson(job.savePath);
-    const videoFile = findYoutubeVideoFile(job.savePath);
-    if (!videoFile) {
+    const mediaFile = fallbackMedia || findYoutubeMediaFile(
+      job.savePath,
+      Boolean(job.onlyAudio)
+    );
+    if (!mediaFile) {
       job.state = "error";
       job.error = "Video dosyası bulunamadı";
       console.warn("❌ yt-dlp çıktı video bulunamadı:", {
@@ -979,10 +1013,10 @@ async function finalizeYoutubeJob(job, exitCode) {
       return;
     }
 
-    const absVideo = path.join(job.savePath, videoFile);
-    const stats = fs.statSync(absVideo);
-    const mediaInfo = await extractMediaInfo(absVideo).catch(() => null);
-    const relativeName = videoFile.replace(/\\/g, "/");
+    const absMedia = path.join(job.savePath, mediaFile);
+    const stats = fs.statSync(absMedia);
+    const mediaInfo = await extractMediaInfo(absMedia).catch(() => null);
+    const relativeName = mediaFile.replace(/\\/g, "/");
     job.files = [
       {
         index: 0,
@@ -991,15 +1025,16 @@ async function finalizeYoutubeJob(job, exitCode) {
       }
     ];
     job.selectedIndex = 0;
-    job.title = deriveYoutubeTitle(videoFile, job.videoId);
+    job.title = deriveYoutubeTitle(mediaFile, job.videoId);
     job.downloaded = stats.size;
     job.totalBytes = stats.size;
     job.progress = 1;
     job.state = "completed";
+    job.error = null;
 
     const metadataPayload = await writeYoutubeMetadata(
       job,
-      absVideo,
+      absMedia,
       mediaInfo,
       infoJson
     );
@@ -1042,12 +1077,30 @@ async function finalizeYoutubeJob(job, exitCode) {
   }
 }
 
-function findYoutubeVideoFile(savePath) {
+function findYoutubeMediaFile(savePath, preferAudio = false) {
   const entries = fs.readdirSync(savePath, { withFileTypes: true });
-  const videos = entries
+  const files = entries
     .filter((entry) => entry.isFile())
-    .map((entry) => entry.name)
-    .filter((name) => VIDEO_EXTS.includes(path.extname(name).toLowerCase()));
+    .map((entry) => entry.name);
+
+  const audioExts = Array.from(MUSIC_EXTENSIONS);
+  if (preferAudio) {
+    const audios = files.filter((name) =>
+      audioExts.includes(path.extname(name).toLowerCase())
+    );
+    if (audios.length) {
+      audios.sort((a, b) => {
+        const aSize = fs.statSync(path.join(savePath, a)).size;
+        const bSize = fs.statSync(path.join(savePath, b)).size;
+        return bSize - aSize;
+      });
+      return audios[0];
+    }
+  }
+
+  const videos = files.filter((name) =>
+    VIDEO_EXTS.includes(path.extname(name).toLowerCase())
+  );
   if (!videos.length) return null;
   videos.sort((a, b) => {
     const aSize = fs.statSync(path.join(savePath, a)).size;
@@ -1075,8 +1128,7 @@ function deriveYoutubeTitle(fileName, videoId) {
   return cleaned.replace(/[-_.]+$/g, "").trim() || base;
 }
 
-function isYoutubeMusic(infoJson, mediaInfo, audioOnlyFlag = false) {
-  if (audioOnlyFlag) return true;
+function isYoutubeMusic(infoJson, mediaInfo) {
   const categories = Array.isArray(infoJson?.categories)
     ? infoJson.categories.map((c) => String(c).toLowerCase())
     : [];
@@ -1108,7 +1160,7 @@ async function writeYoutubeMetadata(job, videoPath, mediaInfo, infoJsonFile) {
   const categories = Array.isArray(infoJson?.categories)
     ? infoJson.categories
     : null;
-  const isAudioOnly = isYoutubeMusic(infoJson, mediaInfo, Boolean(job.onlyAudio));
+  const isAudioOnly = isYoutubeMusic(infoJson, mediaInfo) || Boolean(job.onlyAudio);
   const derivedType = determineMediaType({
     tracker: "youtube",
     movieMatch: null,