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

tag/delete_tag.rs

@@ -0,0 +1,29 @@
+use crate::bare::GitBare;
+use crate::error::{GitError, GitResult};
+use crate::pb::DeleteTagRequest;
+
+impl GitBare {
+    pub fn delete_tag(&self, request: DeleteTagRequest) -> GitResult<()> {
+        let result = duct::cmd(
+            "git",
+            [
+                "--git-dir",
+                self.bare_dir.to_string_lossy().as_ref(),
+                "tag",
+                "-d",
+                &request.name,
+            ],
+        )
+        .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(())
+    }
+}