[Lint] Add python/sglang to ruff F401 checks and remove unused imports in files (#11685)

python/sglang/srt/entrypoints/context.py

@@ -1,6 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 # Copied from vLLM
-import json
 import logging
 from abc import ABC, abstractmethod
 from typing import Union

python/sglang/srt/entrypoints/harmony_utils.py

@@ -3,7 +3,6 @@
 # Adapted from vLLM: https://github.com/vllm-project/vllm/blob/1b9902806915040ac9b3029f2ab7522ec505afc3/vllm/entrypoints/harmony_utils.py
 # Slight differences in processing chat messages
 import datetime
-import json
 from collections.abc import Iterable
 from typing import Literal, Optional, Union
 

python/sglang/srt/entrypoints/http_server.py

@@ -19,7 +19,6 @@ This file implements HTTP APIs for the inference engine via fastapi.
 
 import asyncio
 import dataclasses
-import json
 import logging
 import multiprocessing as multiprocessing
 import os

python/sglang/srt/entrypoints/http_server_engine.py

@@ -1,15 +1,9 @@
-import copy
-import dataclasses
 import multiprocessing
-import pickle
-import threading
 import time
-from typing import Any, Dict, List, Optional, Tuple, Union
+from typing import List, Optional, Tuple
 
-import pybase64
 import requests
 import torch
-import torch.distributed as dist
 
 from sglang.srt.entrypoints.EngineBase import EngineBase
 from sglang.srt.entrypoints.http_server import launch_server