[Bug Fix] Add priority property to DecodeRequest to fix AttributeError with --enable-priority-scheduling (#25064)

python/sglang/srt/disaggregation/decode.py

@@ -252,6 +252,10 @@ class DecodeRequest:
     def seqlen(self) -> int:
         return self.req.seqlen
 
+    @property
+    def priority(self) -> Optional[int]:
+        return self.req.priority
+
 
 class DecodePreallocQueue:
     """