style: apply cargo fmt to entire codebase

Standardize code formatting across all 173 Rust source files
using rustfmt. No functional changes - purely cosmetic.

This establishes a consistent code style baseline for the
project going forward.

src/application/ports/zip_ports.rs

@@ -4,8 +4,8 @@
 //! keeping the interface layer independent of specific ZIP
 //! implementation details.
 
-use async_trait::async_trait;
 use crate::common::errors::DomainError;
+use async_trait::async_trait;
 
 /// Port for ZIP archive operations.
 ///