fix: not install libmagic raise error

[hjlarry]

Summary

Tip

Close issue syntax: Fixes #<issue number> or Resolves #<issue number>, see documentation for more details.

fix #13109

the import magic will raise error on different platforms if libmagic is not installed, on my local windows it will raise:

Error: While importing 'app', an ImportError was raised:

Traceback (most recent call last):
  File "c:\Users\hejl\PycharmProjects\dify\api\.venv\Lib\site-packages\flask\cli.py", line 245, in locate_app
    __import__(module_name)
  File "C:\Users\hejl\PycharmProjects\dify\api\app.py", line 37, in <module>
    app = create_app()
          ^^^^^^^^^^^^
  File "C:\Users\hejl\PycharmProjects\dify\api\app_factory.py", line 25, in create_app
    initialize_extensions(app)
  File "C:\Users\hejl\PycharmProjects\dify\api\app_factory.py", line 87, in initialize_extensions
    ext.init_app(app)
  File "C:\Users\hejl\PycharmProjects\dify\api\extensions\ext_blueprints.py", line 10, in init_app
    from controllers.console import bp as console_app_bp
  File "C:\Users\hejl\PycharmProjects\dify\api\controllers\console\__init__.py", line 26, in <module>
    from .remote_files import RemoteFileInfoApi, RemoteFileUploadApi
  File "C:\Users\hejl\PycharmProjects\dify\api\controllers\console\remote_files.py", line 9, in <module>
    from controllers.common import helpers
  File "C:\Users\hejl\PycharmProjects\dify\api\controllers\common\helpers.py", line 10, in <module>
    import magic
  File "c:\Users\hejl\PycharmProjects\dify\api\.venv\Lib\site-packages\magic\__init__.py", line 209, in <module>
    libmagic = loader.load_lib()
               ^^^^^^^^^^^^^^^^^
  File "c:\Users\hejl\PycharmProjects\dify\api\.venv\Lib\site-packages\magic\loader.py", line 49, in load_lib
    raise ImportError('failed to find libmagic.  Check your installation')
ImportError: failed to find libmagic.  Check your installation

Guessing the mimetype for every user isn't particularly important; a warning message should suffice.

Screenshots

Before	After
...	...

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[laipz8200]

Awesome job, thanks!