feat: add activity feed/users/profile use cases and port methods

crates/application/src/use_cases/get_activity_feed.rs

@@ -0,0 +1,13 @@
+use domain::{
+    errors::DomainError,
+    models::{FeedEntry, collections::{PageParams, Paginated}},
+};
+use crate::{context::AppContext, queries::GetActivityFeedQuery};
+
+pub async fn execute(
+    ctx: &AppContext,
+    query: GetActivityFeedQuery,
+) -> Result<Paginated<FeedEntry>, DomainError> {
+    let page = PageParams::new(query.limit, query.offset)?;
+    ctx.repository.query_activity_feed(&page).await
+}