fix: exit with code 1 when yt-append-description fails

Add error exit code for bash error handling when video updates fail.
Program now returns exit code 1 instead of 0 when any video fails
to update (e.g., quota exceeded errors).

Author: leafyoung

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "rust-yt-uploader"
-version = "0.2.16"
+version = "0.2.17"
 edition = "2024"
 rust-version = "1.89"
 authors = ["Yang Ye <yy@runchee.com>"]

Cargo.toml

@@ -192,6 +192,11 @@ async fn main() -> Result<()> {
         );
     }
 
+    // Exit with error code 1 if any video failed
+    if error_count > 0 {
+        anyhow::bail!("{} video(s) failed to update", error_count);
+    }
+
     Ok(())
 }