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

init.rs

@@ -0,0 +1,24 @@
+use crate::bare::GitBare;
+use crate::error::{GitError, GitResult};
+
+impl GitBare {
+    pub fn init_repository(&self, bare: bool) -> GitResult<()> {
+        let mut args = vec!["init".to_string()];
+        if bare {
+            args.push("--bare".into());
+        }
+        args.push(self.bare_dir.to_string_lossy().into_owned());
+        let result = duct::cmd("git", &args)
+            .stdout_capture()
+            .stderr_capture()
+            .unchecked()
+            .run()?;
+        if !result.status.success() {
+            return Err(GitError::CommandFailed {
+                status_code: result.status.code(),
+                stderr: String::from_utf8_lossy(&result.stderr).into_owned(),
+            });
+        }
+        Ok(())
+    }
+}