feat: add profile option to Args with default 'default'

Co-authored-by: aider (openai/gpt-5) <aider@aider.chat>

src/main.rs

@@ -26,6 +26,10 @@ struct Args {
     /// The URL of the video/music to download
     #[arg(name = "URL")]
     url: String,
+
+    /// Profile name to use from config (falls back to 'default')
+    #[arg(short, long, default_value = "default")]
+    profile: String,
 }
 
 fn main() -> Result<()> {