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/interfaces/api/mod.rs

@@ -2,4 +2,4 @@ pub mod handlers;
 pub mod routes;
 
 pub use routes::create_api_routes;
-pub use routes::create_public_api_routes;
+pub use routes::create_public_api_routes;