* Update and add GitHub issue templates

Refactored bug and network report templates for clarity and improved user guidance. Added a new web report template for browser-related issues. Renamed feature request template to maintain sequential naming.

* Update web report issue template labels

Changed the default label from 🐛 bug to 💥 web in the web report issue template to better categorize web-related problems.

* Update network-related issue guidance in bug report template

Revised the wording for network-related issues in the bug report template to direct users to 'Report a network-related problem' for clarity.

Renamed 'Web report' to 'Website report' and updated related labels and instructions for clarity. This improves consistency and better reflects the scope of issues being reported.

* Use timezone-aware UTC datetimes in client modules

Replaced usage of datetime.utcnow() with datetime.now(UTC) in both Client and CosClient classes to ensure timezone-aware UTC datetime objects. This addresses previous issues with naive datetime objects and improves reliability in time comparisons.

* Refactor UTC time handling and add utc_time utility

Introduced a new utc_time() utility in swanlab/env.py to standardize UTC datetime retrieval. Updated Client and CosClient to use utc_time() instead of direct datetime usage. Added unit tests for utc_time to ensure correct behavior.

* Fix timezone handling for sid and COS expiration checks

Updated sid expiration and COS expiration logic to correctly handle timezone-aware datetime objects. Removed redundant sid_expired_at property and ensured UTC timezone is set for sid expiration comparison.

Co-authored-by: Zhiyuan Zhao <[email protected]>
Co-authored-by: Kang Li <[email protected]>

Translated all GitHub issue templates and config descriptions from English to Chinese, including bug, network, website, and feature request forms. Also updated label formatting for clarity and consistency.