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

rate_limit.rs

@@ -192,8 +192,7 @@ pub fn set_max_concurrent(max: usize) {
         .collect();
 
     for key in keys {
-        l.semaphores
-            .insert(key, Arc::new(Semaphore::new(max)));
+        l.semaphores.insert(key, Arc::new(Semaphore::new(max)));
     }
 
     tracing::info!(max_concurrent = max, "rate limit max_concurrent updated");