feat(core): implement Git repository operations with gRPC services

- Add advertise_refs functionality for Git protocol communication
- Implement archive service with TAR/ZIP format support and streaming
- Create blame service for Git file annotation with line tracking
- Add branch management including create, delete, rename and compare operations
- Implement merge checking with conflict detection and fast-forward handling
- Add cherry-pick functionality for applying commits between branches
- Integrate gix library for Git repository operations and object handling
- Add comprehensive test suite covering all Git operations
- Implement proper error handling and repository validation
- Add pagination support for large result sets
- Create protobuf definitions for all Git operations and data structures
- Add build system for gRPC code generation and dependency management

commit/get_commit_ancestors.rs

@@ -0,0 +1,28 @@
+use crate::bare::GitBare;
+use crate::error::GitResult;
+use crate::pb::{GetCommitAncestorsRequest, GetCommitAncestorsResponse, ListCommitsRequest};
+
+impl GitBare {
+    pub fn get_commit_ancestors(
+        &self,
+        request: GetCommitAncestorsRequest,
+    ) -> GitResult<GetCommitAncestorsResponse> {
+        let response = self.list_commits(ListCommitsRequest {
+            repository: request.repository,
+            revision: request.revision,
+            path: String::new(),
+            since: None,
+            until: None,
+            first_parent: request.first_parent,
+            all: false,
+            reverse: false,
+            max_parents: 0,
+            min_parents: 0,
+            pagination: request.pagination,
+        })?;
+        Ok(GetCommitAncestorsResponse {
+            commits: response.commits,
+            page_info: response.page_info,
+        })
+    }
+}