feat: v2 rewrite — hexagonal arch, ActivityPub federation, NATS, deployment-ready (#1)

crates/application/src/use_cases/feed.rs

@@ -0,0 +1,17 @@
+use domain::{
+    errors::DomainError,
+    models::feed::{FeedEntry, PageParams, Paginated},
+    ports::{FeedQuery, FeedRepository, FollowRepository},
+    value_objects::UserId,
+};
+
+pub async fn get_home_feed(
+    feed: &dyn FeedRepository,
+    follows: &dyn FollowRepository,
+    user_id: &UserId,
+    page: PageParams,
+) -> Result<Paginated<FeedEntry>, DomainError> {
+    let mut following_ids = follows.get_accepted_following_ids(user_id).await?;
+    following_ids.push(user_id.clone());
+    feed.query(&FeedQuery::home(user_id.clone(), following_ids, page)).await
+}