feat(server): add tracing spans and caching to archive and blame services

- Add tracing spans with repo labels for archive and blame operations
- Implement caching for archive list entries when using OID selectors
- Implement caching for blame operations when using OID selectors
- Add detailed

merge/do_merge.rs

@@ -6,11 +6,16 @@ impl GitBare {
     pub fn merge(&self, request: MergeRequest) -> GitResult<MergeResult> {
         let target_branch = request.target_branch.clone();
         let source_revision = match request.source.and_then(|s| s.selector) {
-            Some(crate::pb::object_selector::Selector::Oid(oid)) => oid.hex,
-            Some(crate::pb::object_selector::Selector::Revision(name)) => name.revision,
+            Some(crate::pb::object_selector::Selector::Oid(oid)) => oid.hex.clone(),
+            Some(crate::pb::object_selector::Selector::Revision(name)) => name.revision.clone(),
             None => return Err(GitError::InvalidArgument("source is required".into())),
         };
-
+        tracing::info!(
+            repo = %self.bare_dir.display(),
+            target = %target_branch,
+            source = %source_revision,
+            "merging"
+        );
         let repo = self.gix_repo()?;
 
         let branch_ref = format!("refs/heads/{}", target_branch);