fix(feishu): add return_exceptions to asyncio.gather in comment handler

[x7peeps]

Summary

Added return_exceptions=True to asyncio.gather() in the Feishu comment handler to prevent a single failing task from crashing all concurrent comment processing.

Problem

asyncio.gather() without return_exceptions causes one failing concurrent task to propagate its exception and abort all other pending tasks. In the Feishu comment handler, this means one malformed/timeout comment can block processing of all other comments.

Fix

Changed asyncio.gather(*tasks) → asyncio.gather(*tasks, return_exceptions=True).

Testing

• Syntax check passed (py_compile)
• Behavior verified

[alt-glitch]

This was generated by AI during triage.

Resubmission of the same clean single-file fix previously submitted as #61140, #58970, and #36888 (all closed without merge). Related, not a duplicate (their targets are closed). This version is not bundled with unrelated one-liners.

[x7peeps]

Closing as duplicate