Added the playlist generator

src/musicbrainz.rs

@@ -1,5 +1,6 @@
 use shanty_data::MetadataFetcher;
 use shanty_data::MusicBrainzFetcher;
+use shanty_data::http::RateLimiter;
 
 use crate::error::SearchResult;
 use crate::provider::{
@@ -17,6 +18,13 @@ impl MusicBrainzSearch {
             .map_err(|e| crate::error::SearchError::Provider(e.to_string()))?;
         Ok(Self { client })
     }
+
+    /// Create with a shared rate limiter (to coordinate with other MB clients).
+    pub fn with_limiter(limiter: RateLimiter) -> SearchResult<Self> {
+        let client = MusicBrainzFetcher::with_limiter(limiter)
+            .map_err(|e| crate::error::SearchError::Provider(e.to_string()))?;
+        Ok(Self { client })
+    }
 }
 
 impl SearchProvider for MusicBrainzSearch {