修复parse_action函数：移除</answer>标签导致的语法解析错误

[luricheng]

问题描述（Problem Description）

使用 Open-AutoGLM 操作手机时，parse_action 函数解析 LLM 返回的动作指令（如 do(action="Tap", element=[811,188])）时，因指令字符串中混入 非 Python 语法标签，导致 ast.parse 解析失败，抛出 SyntaxError 异常，进而触发 ValueError 报错，无法正常执行点击等操作。

相关报错日志：

Traceback (most recent call last):
  File "/Users/rich/repos/Open-AutoGLM/phone_agent/actions/handler.py", line 362, in parse_action
    tree = ast.parse(response, mode="eval")
  File "/Users/rich/miniconda3/envs/autoglm/lib/python3.10/ast.py", line 50, in parse
    return compile(source, filename, mode, flags,
  File "<unknown>", line 1
    do(action="Tap", element=[811,188])</answer>
                                        ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/rich/repos/Open-AutoGLM/phone_agent/actions/handler.py", line 376, in parse_action
    raise ValueError(f"Failed to parse do() action: {e}")
ValueError: Failed to parse do() action: invalid syntax (<unknown>, line 1)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/rich/repos/Open-AutoGLM/phone_agent/agent.py", line 191, in _execute_step
    action = parse_action(response.action)
  File "/Users/rich/repos/Open-AutoGLM/phone_agent/actions/handler.py", line 387, in parse_action
    raise ValueError(f"Failed to parse action: {e}")
ValueError: Failed to parse action: Failed to parse do() action: invalid syntax (<unknown>, line 1)

解决方案（Solution）

在 phone_agent/actions/handler.py 的 parse_action 函数中，新增字符串清理逻辑，解析前先处理无关字符：

                response = response.replace("</answer>", "")
                response = response.replace("<answer>", "")

                tree = ast.parse(response, mode="eval")