Use ngx_log_error! macro and fix formatting

- Switched from ngx_log_error_core() to ngx_log_error! macro
- Changed error_log level from debug to info (cleaner output)
- Formatting cleanup across all modules (cargo fmt)
- Removed trailing newlines and fixed indentation

Logging now properly uses nginx's macro system for better
integration with nginx's log handling.

build.rs

@@ -7,4 +7,3 @@ fn main() {
         println!("cargo:rustc-link-arg=dynamic_lookup");
     }
 }
-