[Feat] Support update weights without restart server (#1157)

python/sglang/srt/managers/io_struct.py

@@ -278,6 +278,20 @@ class FlushCacheReq:
     pass
 
 
+@dataclass
+class UpdateWeightReqInput:
+    # The model path with the new weights
+    model_path: str
+    # The format to load the weights
+    load_format: Optional[str] = None
+
+
+@dataclass
+class UpdateWeightReqOutput:
+    success: bool
+    message: str
+
+
 @dataclass
 class AbortReq:
     # The request id