Implement --debug flag for logging

[codeautopilot[bot]]

Resolves #424

This PR introduces a --debug flag to the CLI, allowing users to enable logging to a specified file or a default file in the current directory. It includes updates to Cargo.toml for new dependencies, modifications to src/app/utils.rs for the logging setup, and changes to src/main.rs to parse the new flag and initialize logging.

[codeautopilot[bot]]

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