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

pack/fsck.rs

@@ -0,0 +1,45 @@
+use crate::bare::GitBare;
+use crate::error::GitResult;
+use crate::pb::{FsckRequest, FsckResponse};
+
+impl GitBare {
+    pub fn fsck(&self, request: FsckRequest) -> GitResult<FsckResponse> {
+        let mut args = vec![
+            "--git-dir".to_string(),
+            self.bare_dir.to_string_lossy().into_owned(),
+            "fsck".to_string(),
+        ];
+        if request.strict {
+            args.push("--strict".into());
+        }
+        if request.connectivity_only {
+            args.push("--connectivity-only".into());
+        }
+        let result = duct::cmd("git", &args)
+            .stdout_capture()
+            .stderr_capture()
+            .unchecked()
+            .run()?;
+        let stdout = String::from_utf8_lossy(&result.stdout);
+        let stderr = String::from_utf8_lossy(&result.stderr);
+        let ok = result.status.success();
+        let mut errors = Vec::new();
+        let mut warnings = Vec::new();
+        for line in stdout.lines().chain(stderr.lines()) {
+            if line.contains("error:") || line.contains("fatal:") {
+                errors.push(
+                    line.trim_start_matches("error: ")
+                        .trim_start_matches("fatal: ")
+                        .to_string(),
+                );
+            } else if line.contains("warning:") {
+                warnings.push(line.trim_start_matches("warning: ").to_string());
+            }
+        }
+        Ok(FsckResponse {
+            ok,
+            errors,
+            warnings,
+        })
+    }
+}