refactor(server): replace custom remote clients with macro-based implementation

- Replaced manual remote client functions with remote_client! macro for archive, blame, branch, commit, and diff services
- Simplified remote client creation logic using declarative macro approach
- Maintained same functionality while reducing code duplication across services

security(bare): enhance path traversal protection with comprehensive validation

- Added early relative_path validation to prevent path traversal attacks
- Implemented unified path validation to avoid TOCTOU race conditions
- Enhanced canonicalization checks for both existing and non-existent paths
- Added detailed logging for path traversal detection attempts

feat(cache): migrate from CLruCache to Moka with TTL and invalidation support

- Replaced clru dependency with moka for improved caching capabilities
- Added 300-second time-to-live for cache entries
- Implemented repository-specific cache invalidation mechanism
- Enhanced cache operations with thread-safe async support

refactor(commit): improve security validation for commit operations

- Added ref name validation to prevent command injection in cherry_pick_commit
- Implemented revision validation for commit selectors
- Added comprehensive input validation for create_commit parameters
- Enhanced file path validation to prevent traversal

diff/get_diff.rs

@@ -19,16 +19,25 @@ struct RawDiffEntry {
     similarity: f64,
 }
 
+/// Type alias for diff raw output: (entries, numstat_map)
+type DiffRawOutput = (Vec<RawDiffEntry>, HashMap<String, (u32, u32, bool)>);
+
 impl GitBare {
     pub fn get_diff(&self, request: GetDiffRequest) -> GitResult<GetDiffResponse> {
         let base = match request.base.and_then(|s| s.selector) {
             Some(crate::pb::object_selector::Selector::Oid(oid)) => oid.hex.clone(),
-            Some(crate::pb::object_selector::Selector::Revision(name)) => name.revision.clone(),
+            Some(crate::pb::object_selector::Selector::Revision(name)) => {
+                crate::sanitize::validate_revision(&name.revision)?;
+                name.revision.clone()
+            }
             None => "HEAD".into(),
         };
         let head = match request.head.and_then(|s| s.selector) {
             Some(crate::pb::object_selector::Selector::Oid(oid)) => oid.hex.clone(),
-            Some(crate::pb::object_selector::Selector::Revision(name)) => name.revision.clone(),
+            Some(crate::pb::object_selector::Selector::Revision(name)) => {
+                crate::sanitize::validate_revision(&name.revision)?;
+                name.revision.clone()
+            }
             None => "HEAD".into(),
         };
         tracing::debug!(
@@ -142,7 +151,7 @@ impl GitBare {
         base: &str,
         head: &str,
         options: Option<&crate::pb::DiffOptions>,
-    ) -> GitResult<(Vec<RawDiffEntry>, HashMap<String, (u32, u32, bool)>)> {
+    ) -> GitResult<DiffRawOutput> {
         let mut args = vec![
             "--git-dir".to_string(),
             self.bare_dir.to_string_lossy().into_owned(),