refactor: remove SocialQueryPort — replaced by SocialQuery + FederationAdminQuery

-319 lines. Legacy SocialQueryPort trait, NoopSocialQueryPort,
PanicSocialQueryPort all deleted. Federation repos now implement
FederationAdminQuery (single method). get_users uses FederationAdminQuery.
All other consumers use unified SocialQuery.

crates/domain/src/ports/noop.rs

@@ -94,38 +94,18 @@ impl super::SocialQuery for NoopSocialQuery {
     async fn get_accepted_following_urls(&self, _: &UserId) -> Result<Vec<String>, DomainError> {
         Ok(vec![])
     }
-    async fn list_all_followed_remote_actors(
-        &self,
-    ) -> Result<Vec<crate::models::RemoteActorInfo>, DomainError> {
-        Ok(vec![])
-    }
 }
 
-// ── NoopSocialQueryPort ───────────────────────────────────────────────────────
+// ── NoopFederationAdminQuery ─────────────────────────────────────────────────
 
 /// Stub used when federation is disabled — returns empty results.
-pub struct NoopSocialQueryPort;
+pub struct NoopFederationAdminQuery;
 
 #[async_trait]
-impl super::SocialQueryPort for NoopSocialQueryPort {
-    async fn get_accepted_following_urls(&self, _: &UserId) -> Result<Vec<String>, DomainError> {
-        Ok(vec![])
-    }
+impl super::FederationAdminQuery for NoopFederationAdminQuery {
     async fn list_all_followed_remote_actors(
         &self,
     ) -> Result<Vec<crate::models::RemoteActorInfo>, DomainError> {
         Ok(vec![])
     }
-    async fn count_following(&self, _: &UserId) -> Result<usize, DomainError> {
-        Ok(0)
-    }
-    async fn count_accepted_followers(&self, _: &UserId) -> Result<usize, DomainError> {
-        Ok(0)
-    }
-    async fn get_pending_followers(
-        &self,
-        _: &UserId,
-    ) -> Result<Vec<crate::models::PendingFollowerInfo>, DomainError> {
-        Ok(vec![])
-    }
 }