20260413_2 并行化架构优化第一阶段，apnic 串行98s->并行74s，传输层任务并行，同repo内发布点串行

src/fetch/rsync.rs

@@ -20,7 +20,7 @@ pub fn normalize_rsync_base_uri(s: &str) -> String {
 ///
 /// v1: this is intentionally abstract so unit tests can use a mock, and later we can
 /// back it by calling the system `rsync` binary (RFC 6481 §5; RFC 8182 §3.4.5).
-pub trait RsyncFetcher {
+pub trait RsyncFetcher: Send + Sync {
     /// Return a list of objects as `(rsync_uri, bytes)` pairs.
     fn fetch_objects(&self, rsync_base_uri: &str) -> RsyncFetchResult<Vec<(String, Vec<u8>)>>;
 
@@ -56,6 +56,7 @@ pub trait RsyncFetcher {
 ///
 /// This is primarily meant for offline tests and fixtures. The key generation mimics rsync URIs:
 /// `rsync_base_uri` + relative path (with `/` separators).
+#[derive(Clone, Debug)]
 pub struct LocalDirRsyncFetcher {
     pub root_dir: PathBuf,
 }