[DSPARK] Grammar-constrained decoding, incl. tool_choice=auto (#31753)

Co-authored-by: shanemort1982 <shanemort1982@users.noreply.github.com>
Co-authored-by: hnyls2002 <lsyincs@gmail.com>

python/sglang/srt/managers/scheduler.py

@@ -2253,9 +2253,7 @@ class Scheduler(
         self._maybe_namespace_elastic_radix_cache(req)
 
         if self.spec_algorithm.is_dflash_family():
-            error_msg = validate_dflash_request(
-                req, self.enable_overlap, self.spec_algorithm
-            )
+            error_msg = validate_dflash_request(req, self.enable_overlap)
             if error_msg is not None:
                 req.set_finish_with_abort(error_msg)
                 self.init_req_max_new_tokens(req)