refactor(build): reformat code and add tonic health dependency

- Reformatted build script with proper indentation and line breaks
- Added tonic-health dependency to Cargo.toml and updated lock file
- Improved error handling in disk cache with concurrent deletion checks
- Refactored conditional chains using && and let expressions
- Reformatted struct initialization and function parameter lists
- Added proper spacing and alignment in language stats processing
- Improved assertion formatting in test cases
- Reorganized import statements and code layout in multiple files
- Updated metrics functions with better parameter handling and formatting

Cargo.toml

@@ -33,6 +33,7 @@ thiserror = { version = "2", features = [] }
 prost = "0.14"
 prost-types = "0.14"
 tonic = { version = "0.14", features = ["transport"] }
+tonic-health = "0.14.6"
 tonic-prost = "0.14"
 tempfile = "3"
 dotenvy = "0.15"