fix: use IPv4 for YouTube extraction

YouTube returned an anti-bot challenge on the default network route. The same installed extractor succeeds over IPv4 without cookies. Apply the route choice to shared search, feed and metadata extraction.

src/youtube.rs

@@ -824,7 +824,13 @@ fn isolated_command(program: &OsStr) -> Command {
 
 fn extractor() -> Command {
     let mut command = isolated_command(OsStr::new("yt-dlp"));
-    command.args(["--ignore-config", "--no-warnings", "--socket-timeout", "15"]);
+    command.args([
+        "--ignore-config",
+        "--force-ipv4",
+        "--no-warnings",
+        "--socket-timeout",
+        "15",
+    ]);
     command
 }