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/mod.rs

@@ -1,7 +1,7 @@
 pub mod api;
-pub mod web;
-pub mod middleware;
 pub mod errors;
+pub mod middleware;
+pub mod web;
 
 pub use api::create_api_routes;
 pub use api::create_public_api_routes;