fix: profile shows only own reviews, federation display name in community

- diary API accepts user_id filter, profile page passes it
- movie social feed joins ap_remote_actors for handle resolution
- COALESCE prefers actor handle for remote reviews, email for local

crates/api-types/src/diary.rs

@@ -42,6 +42,7 @@ pub struct DiaryQueryParams {
     pub offset: Option<u32>,
     pub sort_by: Option<String>,
     pub movie_id: Option<Uuid>,
+    pub user_id: Option<Uuid>,
 }
 
 #[derive(Debug, Clone, Deserialize, utoipa::IntoParams)]