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/main.rs

@@ -25,7 +25,9 @@ use sqlite::{SqliteMovieRepository, SqliteUserRepository};
 use sqlite_federation::SqliteFederationRepository;
 use template_askama::AskamaHtmlRenderer;
 
-use presentation::{routes, state::AppState};
+use doc::ApiDocExt;
+use presentation::{openapi::ApiDoc, routes, state::AppState};
+use utoipa::OpenApi as _;
 
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
@@ -36,7 +38,7 @@ async fn main() -> anyhow::Result<()> {
         .await
         .context("Failed to wire dependencies")?;
 
-    let app = routes::build_router(state, ap_router);
+    let app = routes::build_router(state, ap_router).with_api_doc(ApiDoc::openapi());
 
     let host = std::env::var("HOST").unwrap_or_else(|_| "0.0.0.0".to_string());
     let port = std::env::var("PORT").unwrap_or_else(|_| "3000".to_string());