refactor(actor): implement Raft consensus algorithm for cluster leader election

- Add voting mechanism with term tracking and vote persistence
- Implement election triggering logic with majority vote counting
- Add primary/replica role transition handling with state management
- Integrate health check failure detection for automatic elections
- Refactor actor messaging system for distributed coordination
- Update repository registration to query cluster for existing primary
- Add broadcast mechanism for role change notifications
- Implement proper term comparison and duplicate request filtering
- Upgrade dependency versions including tokio-util for async utilities
- Optimize code formatting and line wrapping for improved readability
- Remove redundant blank lines and improve code structure consistency
- Enhance error logging and trace information for debugging purposes

server/commit.rs

@@ -276,7 +276,6 @@ impl commit_service_server::CommitService for GitksService {
         Ok(tonic::Response::new(resp))
     }
 
-
     async fn find_commit(
         &self,
         request: tonic::Request<FindCommitRequest>,
@@ -368,7 +367,6 @@ impl commit_service_server::CommitService for GitksService {
         Ok(tonic::Response::new(resp))
     }
 
-
     async fn count_commits(
         &self,
         request: tonic::Request<CountCommitsRequest>,