Refactor ActivityPub integration and add SQLite federation support

- Removed event-publisher dependency from Cargo.lock and Cargo.toml.
- Introduced sqlite-federation crate with necessary dependencies and implementation.
- Updated activitypub crate to use new ActivityPubPort trait for better abstraction.
- Refactored event handling to utilize domain ports instead of direct dependencies.
- Adjusted presentation layer to accommodate new ActivityPub service structure.
- Removed unused test setup for ActivityPub service in favor of NoopActivityPubService.
- Cleaned up SQLite adapter to remove unnecessary dependencies and streamline functionality.

crates/adapters/activitypub/src/lib.rs

@@ -1,5 +1,6 @@
 pub mod event_handler;
 pub mod objects;
+pub mod port;
 pub mod remote_review_repository;
 pub mod review_handler;
 pub mod user_adapter;
@@ -12,6 +13,7 @@ pub use activitypub_base::{
 };
 
 pub use event_handler::ActivityPubEventHandler;
+pub use port::{ActivityPubPort, NoopActivityPubService};
 pub use remote_review_repository::RemoteReviewRepository;
 pub use review_handler::ReviewObjectHandler;
 pub use user_adapter::DomainUserRepoAdapter;