refactor(bare): enhance security and performance optimizations

- Remove unnecessary sorting in advertise_refs for deterministic output
- Add path traversal detection and validation in bare_dir construction
- Implement symlink resolution checks to prevent security vulnerabilities
- Refactor cache system with CRC validation and improved metrics
- Integrate repo-specific cache invalidation using indexed keys
- Add comprehensive unit tests for commit operations and diff functionality
- Move configuration constants to centralized config module
- Optimize string operations in disk cache random value generation
- Enhance license detection algorithm with cleaner matching logic
- Streamline argument processing in various git operations
- Update dependencies including crc32fast and flate2 for performance
- Add signal handling capability to tokio runtime configuration

diff/get_diff.rs

@@ -367,14 +367,12 @@ impl GitBare {
             )));
         }
 
-        // Split combined patch output by "diff --git" headers
         let mut map = HashMap::new();
         let output = &result.stdout;
         let header = b"diff --git ";
         let mut chunks: Vec<&[u8]> = Vec::new();
         let mut pos = 0;
 
-        // Find all header positions
         let mut header_positions = Vec::new();
         while let Some(idx) = output[pos..]
             .windows(header.len())
@@ -390,7 +388,6 @@ impl GitBare {
         }
 
         for chunk in chunks {
-            // Extract file path from "diff --git a/path b/path\n"
             let first_line_end = chunk
                 .iter()
                 .position(|&b| b == b'\n')