feat(providers): add provider transfer limits

apps/aether-gateway/src/ai_serving/planner/specialized/video.rs

@@ -123,6 +123,11 @@ impl LocalExecutionAttemptSource<AiSyncAttempt> for LocalVideoCreateSyncAttemptS
         }
         Ok(drained)
     }
+
+    async fn skip_provider(&mut self, provider_id: &str) -> Result<(), GatewayError> {
+        self.candidates.skip_provider(provider_id);
+        Ok(())
+    }
 }
 
 impl LocalVideoCreateSyncAttemptSource<'_> {