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

python/sglang/srt/mem_cache/radix_cache.py

@@ -23,7 +23,7 @@ import heapq
 import time
 from collections import defaultdict
 from functools import lru_cache, partial
-from typing import TYPE_CHECKING, Any, Iterator, List, Optional, Tuple, Union
+from typing import TYPE_CHECKING, Iterator, List, Optional, Tuple, Union
 
 import torch