feat(server): add comprehensive Git repository services with test coverage

- Implement ArchiveService for repository archive operations
- Add BlameService for Git blame functionality
- Create BranchService with full branch management capabilities
- Integrate CommitService for commit operations and history
- Add DiffService for generating diffs and patches
- Implement MergeService with conflict resolution features
- Add PackService for Git packfile operations
- Create TagService for Git tag management
- Add TreeService for Git tree operations
- Implement comprehensive repository management functions
- Add repository statistics and health checking capabilities
- Include garbage collection and repacking operations
- Add repository configuration management
- Implement error handling and status conversion utilities
- Add test suite covering all repository operations
- Create utility functions for Git command execution
- Add streaming response support for large data operations
- Implement request resolution and validation helpers

server/branch.rs

@@ -0,0 +1,86 @@
+use crate::pb::*;
+
+use super::{GitksService, into_status, resolve};
+
+#[tonic::async_trait]
+impl branch_service_server::BranchService for GitksService {
+    async fn list_branches(
+        &self,
+        request: tonic::Request<ListBranchesRequest>,
+    ) -> Result<tonic::Response<ListBranchesResponse>, tonic::Status> {
+        let inner = request.into_inner();
+        let gb = resolve(inner.repository.as_ref())?;
+        let resp = gb.list_branches(inner).map_err(into_status)?;
+        Ok(tonic::Response::new(resp))
+    }
+
+    async fn get_branch(
+        &self,
+        request: tonic::Request<GetBranchRequest>,
+    ) -> Result<tonic::Response<Branch>, tonic::Status> {
+        let inner = request.into_inner();
+        let gb = resolve(inner.repository.as_ref())?;
+        let resp = gb.get_branch(inner).map_err(into_status)?;
+        Ok(tonic::Response::new(resp))
+    }
+
+    async fn create_branch(
+        &self,
+        request: tonic::Request<CreateBranchRequest>,
+    ) -> Result<tonic::Response<Branch>, tonic::Status> {
+        let inner = request.into_inner();
+        let gb = resolve(inner.repository.as_ref())?;
+        let resp = gb.create_branch(inner).map_err(into_status)?;
+        Ok(tonic::Response::new(resp))
+    }
+
+    async fn delete_branch(
+        &self,
+        request: tonic::Request<DeleteBranchRequest>,
+    ) -> Result<tonic::Response<()>, tonic::Status> {
+        let inner = request.into_inner();
+        let gb = resolve(inner.repository.as_ref())?;
+        gb.delete_branch(inner).map_err(into_status)?;
+        Ok(tonic::Response::new(()))
+    }
+
+    async fn rename_branch(
+        &self,
+        request: tonic::Request<RenameBranchRequest>,
+    ) -> Result<tonic::Response<Branch>, tonic::Status> {
+        let inner = request.into_inner();
+        let gb = resolve(inner.repository.as_ref())?;
+        let resp = gb.rename_branch(inner).map_err(into_status)?;
+        Ok(tonic::Response::new(resp))
+    }
+
+    async fn update_branch_target(
+        &self,
+        request: tonic::Request<UpdateBranchTargetRequest>,
+    ) -> Result<tonic::Response<Branch>, tonic::Status> {
+        let inner = request.into_inner();
+        let gb = resolve(inner.repository.as_ref())?;
+        let resp = gb.update_branch_target(inner).map_err(into_status)?;
+        Ok(tonic::Response::new(resp))
+    }
+
+    async fn set_branch_upstream(
+        &self,
+        request: tonic::Request<SetBranchUpstreamRequest>,
+    ) -> Result<tonic::Response<Branch>, tonic::Status> {
+        let inner = request.into_inner();
+        let gb = resolve(inner.repository.as_ref())?;
+        let resp = gb.set_branch_upstream(inner).map_err(into_status)?;
+        Ok(tonic::Response::new(resp))
+    }
+
+    async fn compare_branch(
+        &self,
+        request: tonic::Request<CompareBranchRequest>,
+    ) -> Result<tonic::Response<CompareBranchResponse>, tonic::Status> {
+        let inner = request.into_inner();
+        let gb = resolve(inner.repository.as_ref())?;
+        let resp = gb.compare_branch(inner).map_err(into_status)?;
+        Ok(tonic::Response::new(resp))
+    }
+}