Fix log_level variable name in server.py

[Copilot]

This PR fixes the issue where the program throws an exception when running the mcp-get-weather command.

Issue

The error occurs in the logging configuration where the code was trying to access a variable named loglevel which doesn't exist. The error message was:

Traceback (most recent call last):
  File "/root/miniconda3/bin/mcp-get-weather", line 10, in <module>
    sys.exit(main())
             ^^^^^^
  File "/root/miniconda3/lib/python3/site-packages/click/core.py", line 1161, in __call__
    return self.main(*args, **kwargs)
  ...
  File "/root/autodl-tmp/MCP/copilot-test/src/mcp_get_weather/server.py", line 80, in main
    level=getattr(logging, loglevel.upper()),
                           ^^^^^^^^

Fix

The main function defines a parameter called log_level (with an underscore), but was incorrectly trying to use a variable called loglevel (without the underscore) in the logging configuration. The fix was to change the variable name in the logging configuration to match the parameter name:

# Before:
level=getattr(logging, loglevel.upper()),

# After:
level=getattr(logging, log_level.upper()),

Testing

Verified that the command now runs correctly without throwing the exception, and the server starts up properly.

Fixes #1.

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