structural refactor and codebase improvements

crates/application/src/social/get_relation.rs

@@ -0,0 +1,17 @@
+use domain::{
+    errors::DomainError,
+    value_objects::{FollowRelation, SocialIdentity, UserId},
+};
+use uuid::Uuid;
+
+use super::deps::SocialQueryDeps;
+
+pub async fn execute(
+    deps: &SocialQueryDeps,
+    viewer_id: Uuid,
+    target: SocialIdentity,
+) -> Result<FollowRelation, DomainError> {
+    deps.follow_graph
+        .get_relation(&UserId::from_uuid(viewer_id), &target)
+        .await
+}