refactor(domain): remove public_key/private_key from User model — managed by federation adapter

crates/adapters/postgres/src/top_friend.rs

@@ -65,8 +65,6 @@ impl TopFriendRepository for PgTopFriendRepository {
             local: bool,
             ap_id: Option<String>,
             inbox_url: Option<String>,
-            public_key: Option<String>,
-            private_key: Option<String>,
             created_at: chrono::DateTime<chrono::Utc>,
             updated_at: chrono::DateTime<chrono::Utc>,
         }
@@ -74,7 +72,7 @@ impl TopFriendRepository for PgTopFriendRepository {
             "SELECT tf.user_id AS tf_user_id, tf.friend_id, tf.position,
              u.id, u.username, u.email, u.password_hash, u.display_name, u.bio,
              u.avatar_url, u.header_url, u.custom_css, u.local, u.ap_id, u.inbox_url,
-             u.public_key, u.private_key, u.created_at, u.updated_at
+             u.created_at, u.updated_at
              FROM top_friends tf JOIN users u ON u.id=tf.friend_id
              WHERE tf.user_id=$1 ORDER BY tf.position",
         )
@@ -105,8 +103,6 @@ impl TopFriendRepository for PgTopFriendRepository {
                     local: r.local,
                     ap_id: r.ap_id,
                     inbox_url: r.inbox_url,
-                    public_key: r.public_key,
-                    private_key: r.private_key,
                     created_at: r.created_at,
                     updated_at: r.updated_at,
                 };