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.

Cargo.toml

@@ -7,6 +7,7 @@ members = [
     "crates/adapters/poster-storage",
     "crates/adapters/rss",
     "crates/adapters/sqlite",
+    "crates/adapters/sqlite-federation",
     "crates/adapters/template-askama",
     "crates/adapters/activitypub",
     "crates/adapters/activitypub-base",
@@ -48,6 +49,7 @@ poster-storage = { path = "crates/adapters/poster-storage" }
 event-publisher = { path = "crates/adapters/event-publisher" }
 rss = { path = "crates/adapters/rss" }
 sqlite = { path = "crates/adapters/sqlite" }
+sqlite-federation = { path = "crates/adapters/sqlite-federation" }
 template-askama = { path = "crates/adapters/template-askama" }
 activitypub = { path = "crates/adapters/activitypub" }
 activitypub-base = { path = "crates/adapters/activitypub-base" }