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/domain/services/mod.rs

@@ -2,4 +2,4 @@ pub mod i18n_service;
 pub mod path_service;
 
 // NOTE: auth_service has been moved to infrastructure/services/jwt_service.rs
-// The functionality is now exposed through application/ports/auth_ports.rs (TokenServicePort)
+// The functionality is now exposed through application/ports/auth_ports.rs (TokenServicePort)