feat(config): add local problem config with auto-detection

[dfayd0]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces local problem configuration with auto-detection functionality to the LeetCode CLI tool. The feature automatically creates and uses local configuration files to streamline the development workflow for LeetCode problems.

• Adds LocalConfig struct for managing problem-specific settings (ID, name, language)
• Implements auto-detection of problem configuration from current or parent directories
• Updates CLI commands to make ID and file path parameters optional when local config is available

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/local_config.rs	New module implementing local configuration functionality with TOML serialization and directory traversal
src/cli.rs	Updated CLI command definitions to make problem ID and file path optional
src/main.rs	Integrated local config resolution into test and submit command flows
src/leetcode_api_runner.rs	Added local config file creation during problem initialization and improved test output formatting
src/lib.rs	Exported new LocalConfig module
tests/local_config_tests.rs	Comprehensive test suite for local configuration functionality
tests/cli_tests.rs	Updated CLI tests to handle optional parameters
README.md	Added documentation for local configuration features and usage examples

[Copilot]

This condition will never be reached because the outer match pattern _ only matches when path_to_file is None, making this check redundant and creating unreachable code.

Suggested change

	}
	// The check for path_to_file.is_none() is unreachable and has been removed.

[Copilot]

This line will panic because path_to_file is guaranteed to be None in this code path (since we're in the _ branch of the match and the previous condition checks for path_to_file.is_none()). The function should return an error instead of potentially panicking.

Suggested change

	Ok((id.unwrap(), path_to_file.unwrap()))
	match (id, path_to_file) {
	(Some(id), Some(path)) => Ok((id, path)),
	_ => Err(io::Error::new(
	io::ErrorKind::Other,
	"Unexpected error: id or path_to_file missing after checks",
	)),
	}

[Copilot]

[nitpick] The term 'localConfig' should be consistently formatted as 'local config' (with a space) to match the documentation and other references in the codebase.

Suggested change

	"\n(ps: to use localConfig feature, you should \ncd \
	"\n(ps: to use local config feature, you should \ncd \