Fix ffmpeg spawn failure causing infinite retry loop

Two issues fixed:
1. Cross-platform ffmpeg-static resolution: skip Windows .exe paths on Linux
   and always fall back to "ffmpeg" instead of a known-bad path
2. Prevent trackEnd cascade when ffmpeg spawn fails — track consecutive
   failures and stop after 3, suppressing trackEnd on spawn errors

https://claude.ai/code/session_013vHRF8BbDGjZLqheFS85Q6

src/web/api/player.ts

@@ -154,6 +154,7 @@ export function createPlayerRouter(
       }
       const queue = bot.getQueueManager();
       bot.getPlayer().stop(); // Stop current playback first
+      bot.getPlayer().resetFailures(); // Reset on user-initiated play
       const song = queue.playAt(index);
       if (!song) {
         res.status(400).json({ error: "Invalid queue index" });
@@ -200,6 +201,7 @@ export function createPlayerRouter(
 
       // Stop current playback
       bot.getPlayer().stop();
+      bot.getPlayer().resetFailures();
 
       const songs = await provider.getPlaylistSongs(playlistId);
       if (songs.length === 0) {
@@ -256,6 +258,7 @@ export function createPlayerRouter(
       queue.add({ ...song, platform: provider.platform });
       queue.play();
 
+      bot.getPlayer().resetFailures();
       const ok = await bot.resolveAndPlay(queue.current()!);
       if (!ok) {
         res.json({ message: `Cannot play: ${song.name}` });