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/repository.rs

@@ -434,7 +434,6 @@ impl repository_service_server::RepositoryService for GitksService {
         Ok(tonic::Response::new(resp))
     }
 
-
     async fn list_hooks(
         &self,
         request: tonic::Request<ListHooksRequest>,
@@ -495,7 +494,6 @@ impl repository_service_server::RepositoryService for GitksService {
         Ok(tonic::Response::new(()))
     }
 
-
     async fn create_snapshot(
         &self,
         request: tonic::Request<CreateSnapshotRequest>,
@@ -600,7 +598,6 @@ impl repository_service_server::RepositoryService for GitksService {
         Ok(tonic::Response::new(()))
     }
 
-
     type FetchRepositoryDataStream =
         ReceiverStream<Result<FetchRepositoryDataResponse, tonic::Status>>;
 
@@ -698,7 +695,6 @@ impl repository_service_server::RepositoryService for GitksService {
         Ok(tonic::Response::new(ReceiverStream::new(rx)))
     }
 
-
     async fn find_merge_base(
         &self,
         request: tonic::Request<FindMergeBaseRequest>,
@@ -751,7 +747,6 @@ impl repository_service_server::RepositoryService for GitksService {
         Ok(tonic::Response::new(resp))
     }
 
-
     async fn objects_size(
         &self,
         request: tonic::Request<ObjectsSizeRequest>,
@@ -795,7 +790,8 @@ impl repository_service_server::RepositoryService for GitksService {
         &self,
         request: tonic::Request<CreateRepositoryFromUrlRequest>,
     ) -> Result<tonic::Response<CreateRepositoryFromUrlResponse>, tonic::Status> {
-        let m = crate::metrics::RequestMetrics::new("gitks.RepositoryService/CreateRepositoryFromURL");
+        let m =
+            crate::metrics::RequestMetrics::new("gitks.RepositoryService/CreateRepositoryFromURL");
         let inner = request.into_inner();
         let _rate = self.acquire_rate_limit(inner.repository.as_ref()).await?;
         let bare_dir = self.resolve_for_init(inner.repository.as_ref())?;
@@ -816,7 +812,6 @@ impl repository_service_server::RepositoryService for GitksService {
         }))
     }
 
-
     async fn find_license(
         &self,
         request: tonic::Request<FindLicenseRequest>,