feat: add documentation crate and integrate OpenAPI specifications

- Added a new crate `doc` for API documentation.
- Integrated `utoipa` for OpenAPI support in the presentation layer.
- Updated routes to include social features (follow, unfollow, etc.) and diary export.
- Enhanced API request and response structures with new DTOs for social interactions.
- Updated `Cargo.toml` files to include new dependencies and features.
- Modified Dockerfile to copy the new documentation crate.
- Refactored existing handlers and routes to accommodate new API endpoints.
- Updated tests to cover new functionality and ensure proper API behavior.

crates/presentation/src/lib.rs

@@ -3,6 +3,7 @@ pub mod errors;
 pub mod event_handlers;
 pub mod extractors;
 pub mod handlers;
+pub mod openapi;
 pub mod ports;
 pub mod routes;
 pub mod state;