feat: treat empty run_id string as equivalent to None

[ShaohonChen]

Description

This PR updates the handling of the id parameter in swanlab.init() and the SWANLAB_RUN_ID environment variable to treat empty strings ("") as equivalent to None.

🎯 PRs Should Target Issues

None

[gemini-code-assist]

Summary of Changes

Hello @ShaohonChen, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the swanlab library by standardizing the treatment of empty strings for run IDs. It ensures that an empty string provided as a run ID is consistently interpreted as None, improving the robustness and predictability of ID validation within the swanlab.init function. The changes are supported by updated unit tests, confirming the intended behavior.

Highlights

• Run ID Handling: The check_run_id_format function now explicitly treats an empty string ("") as equivalent to None when validating run IDs, aligning with the intent to simplify ID management.
• Code Refactoring: The swanlab.init function has been refactored to call check_run_id_format earlier in its execution flow, ensuring consistent validation of the id parameter and removing a redundant check.
• Test Updates: Unit tests have been updated to reflect the new behavior, specifically modifying test_run_id_format_empty_string to assert that an empty string run_id correctly results in None.

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[gemini-code-assist]

Code Review

This pull request successfully updates the logic to treat an empty run_id string as equivalent to None. The changes are well-implemented across the data SDK, formatter, and tests. The refactoring in swanlab/data/sdk.py simplifies the code, and the corresponding test case in test/unit/test_formatter.py is correctly updated. I have a minor suggestion to make the code in swanlab/formatter.py more idiomatic.