debug log enabled by default with hardcoded path

[skochinsky]

After installing, I've got this stack trace:

C:\Users\Igor\AppData\Roaming\Hex-Rays\IDA Pro\plugins\ida-chat\ida_chat_plugin.py: [Errno 2] No such file or directory: 'C:\\tmp\\ida-chat.log'
Traceback (most recent call last):
  File "C:\Program Files\IDA Professional 9.2\python\ida_idaapi.py", line 502, in IDAPython_ExecScript
    exec(code, g)
  File "C:/Users/Igor/AppData/Roaming/Hex-Rays/IDA Pro/plugins/ida-chat/ida_chat_plugin.py", line 44, in <module>
    from ida_chat_core import IDAChatCore, ChatCallback, test_claude_connection
  File "C:\Users\Igor\AppData\Roaming\Hex-Rays\IDA Pro\plugins\ida-chat\ida_chat_core.py", line 29, in <module>
    logging.FileHandler(LOG_FILE, mode="a"),
  File "C:\Python310\Lib\logging\__init__.py", line 1169, in __init__
    StreamHandler.__init__(self, self._open())
  File "C:\Python310\Lib\logging\__init__.py", line 1201, in _open
    return open_func(self.baseFilename, self.mode,
FileNotFoundError: [Errno 2] No such file or directory: 'C:\\tmp\\ida-chat.log'

It seems that LOG_FILE is hardcoded to "/tmp/ida-chat.log" and enabled by default. It should probably use a system-specific path and maybe enabled via a setting.