fix: restore EMA update for output length prediction

During rebase, the RouterStatics.update() call was lost. This is needed
by the scheduler for predicting request output length via EMA calculation.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sufubao

lightllm/server/router/manager.py

@@ -352,6 +352,9 @@ def _filter_reqs_from_running_batch(self):
                         cache_len=req.prompt_cache_len,
                         mtp_accepted=req.mtp_accepted_token_num,
                     )
+                    # Update EMA for output length prediction (used by scheduler)
+                    if not req.is_aborted:
+                        self.router_statics.update(req.candetoken_out_len)
             self.running_batch.filter_out_finished_req(self.shm_req_manager)
             if self.running_batch.is_clear():
                 self.running_batch = None