fix: use browseURL scheme to detect SMB context — iOS maps SMB files to file:// URLs

Sources/NetworkFileBrowser.swift

@@ -488,8 +488,9 @@ struct NetworkFileBrowserIOS: View {
             if let cur = browseURL { pathStack.append(cur) }
             navigateTo(item.url)
         } else if item.isMediaFile {
-            if item.url.scheme == "smb" {
-                // HTTP 流式播放
+            // 如果浏览的根是 SMB 共享，全部走 HTTP 流播放
+            let isSMB = browseURL?.scheme == "smb" || item.url.scheme == "smb"
+            if isSMB {
                 bridge.playSMBSource(url: item.url, name: item.name)
                 if item.hasMatchingASS {
                     bridge.loadExternalSubtitle(url: item.url.deletingPathExtension().appendingPathExtension("ass"))