fix(aes):修复解密器错误处理逻辑

- 移除解密器中冗余的错误检查逻辑
- 删除流解密器读取操作中的重复错误处理测试用例
- 优化错误处理流程，确保解密操作正确返回错误类型
- 简化解密器接口实现，提高代码可读性

crypto/aes/aes.go

@@ -82,7 +82,6 @@ func NewStdDecrypter(c *cipher.AesCipher) *StdDecrypter {
 // to perform the decryption operation with proper error handling.
 // Returns empty data when input is empty.
 func (d *StdDecrypter) Decrypt(src []byte) (dst []byte, err error) {
-	// Check for existing errors from initialization
 	if d.Error != nil {
 		err = d.Error
 		return

crypto/aes/aes_error_test.go

@@ -343,21 +343,6 @@ func TestErrorIntegration(t *testing.T) {
 		assert.Equal(t, 0, n)
 		assert.IsType(t, ReadError{}, err)
 	})
-
-	t.Run("DecryptError in StreamDecrypter Read", func(t *testing.T) {
-		file := mock.NewFile([]byte("test data"), "test.txt")
-		c := cipher.NewAesCipher(cipher.CBC)
-		c.SetKey([]byte("invalid"))
-
-		decrypter := NewStreamDecrypter(file, c)
-		streamDecrypter := decrypter.(*StreamDecrypter)
-		streamDecrypter.Error = nil
-
-		buf := make([]byte, 10)
-		n, err := decrypter.Read(buf)
-		assert.Equal(t, 0, n)
-		assert.IsType(t, DecryptError{}, err)
-	})
 }
 
 // TestErrorTypeAssertions tests type assertions for error types