refactor: improve ConstantList exception specificity

Replace generic Exception with TypeError for all mutating operations in
ConstantList class. This provides more precise error semantics as these
operations attempt to modify an immutable data structure, which is
fundamentally a type compatibility issue.

Changes:
- append, extend, insert, pop, remove, clear methods
- __setitem__ and __delitem__ magic methods

This improves error handling precision and follows Python best practices
for exception types.

Signed-off-by: zitian.zhao <zitian.zhao@tencentmusic.com>

Author: skyloevil

vllm/v1/utils.py

@@ -34,22 +34,22 @@ def __init__(self, x: list[T]) -> None:
         self._x = x
 
     def append(self, item):
-        raise Exception("Cannot append to a constant list")
+        raise TypeError("Cannot append to a constant list")
 
     def extend(self, item):
-        raise Exception("Cannot extend a constant list")
+        raise TypeError("Cannot extend a constant list")
 
     def insert(self, item):
-        raise Exception("Cannot insert into a constant list")
+        raise TypeError("Cannot insert into a constant list")
 
     def pop(self, item):
-        raise Exception("Cannot pop from a constant list")
+        raise TypeError("Cannot pop from a constant list")
 
     def remove(self, item):
-        raise Exception("Cannot remove from a constant list")
+        raise TypeError("Cannot remove from a constant list")
 
     def clear(self):
-        raise Exception("Cannot clear a constant list")
+        raise TypeError("Cannot clear a constant list")
 
     def index(self,
               item: T,
@@ -78,10 +78,10 @@ def __setitem__(self, s: slice, value: T, /):
         ...
 
     def __setitem__(self, item: Union[int, slice], value: Union[T, list[T]]):
-        raise Exception("Cannot set item in a constant list")
+        raise TypeError("Cannot set item in a constant list")
 
     def __delitem__(self, item):
-        raise Exception("Cannot delete item from a constant list")
+        raise TypeError("Cannot delete item from a constant list")
 
     def __iter__(self):
         return iter(self._x)