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

refs/update_refs.rs

@@ -4,7 +4,10 @@ use crate::pb::*;
 
 impl GitBare {
     /// Update multiple refs atomically using `git update-ref --stdin`.
-    pub fn update_references(&self, request: UpdateReferencesRequest) -> GitResult<UpdateReferencesResponse> {
+    pub fn update_references(
+        &self,
+        request: UpdateReferencesRequest,
+    ) -> GitResult<UpdateReferencesResponse> {
         let mut stdin_input = String::new();
         for update in &request.updates {
             crate::sanitize::validate_ref_name(&update.ref_name)?;
@@ -16,10 +19,7 @@ impl GitBare {
                     update.ref_name, update.new_oid, update.old_oid
                 ));
             } else {
-                stdin_input.push_str(&format!(
-                    "update {} {}\n",
-                    update.ref_name, update.new_oid
-                ));
+                stdin_input.push_str(&format!("update {} {}\n", update.ref_name, update.new_oid));
             }
         }
         if stdin_input.is_empty() {
@@ -27,7 +27,13 @@ impl GitBare {
         }
 
         let output = std::process::Command::new("git")
-            .args(["--git-dir", &self.bare_dir.to_string_lossy(), "update-ref", "--stdin", "-z"])
+            .args([
+                "--git-dir",
+                &self.bare_dir.to_string_lossy(),
+                "update-ref",
+                "--stdin",
+                "-z",
+            ])
             .stdin(std::process::Stdio::piped())
             .stdout(std::process::Stdio::piped())
             .stderr(std::process::Stdio::piped())
@@ -119,21 +125,33 @@ impl GitBare {
             });
         }
 
-        Ok(WriteRefResponse { ok: true, error: String::new() })
+        Ok(WriteRefResponse {
+            ok: true,
+            error: String::new(),
+        })
     }
 
     /// Check if a ref exists.
     pub fn ref_exists(&self, request: RefExistsRequest) -> GitResult<RefExistsResponse> {
         crate::sanitize::validate_ref_name(&request.ref_name)?;
         let repo = self.gix_repo()?;
-        let exists = repo.try_find_reference(&request.ref_name).ok().flatten().is_some();
+        let exists = repo
+            .try_find_reference(&request.ref_name)
+            .ok()
+            .flatten()
+            .is_some();
         Ok(RefExistsResponse { exists })
     }
 
     /// Find the default branch name.
     pub fn find_default_branch_name(&self) -> GitResult<FindDefaultBranchNameResponse> {
         let result = std::process::Command::new("git")
-            .args(["--git-dir", &self.bare_dir.to_string_lossy(), "symbolic-ref", "HEAD"])
+            .args([
+                "--git-dir",
+                &self.bare_dir.to_string_lossy(),
+                "symbolic-ref",
+                "HEAD",
+            ])
             .output()
             .map_err(|e| crate::error::GitError::CommandFailed {
                 status_code: None,