#14037: docs: improved permission configuration instructions

- Remind users to ensure the Feishu plugin is enabled so that the configured event callback steps can execute correctly. - Some permissions are not supported by Lark; the permission import section has been improved, and Feishu and Lark use different JSON formats. <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR updates the Feishu/Lark channel setup docs (English + zh-CN) by adding a reminder to ensure the Feishu plugin is enabled before configuring callbacks, and by splitting the permission “batch import” JSON into separate examples for Feishu (China) vs Lark (international), since they use different formats / supported scopes. Changes are limited to documentation under `docs/channels/` and its zh-CN counterpart, and do not affect runtime code paths. <h3>Confidence Score: 4/5</h3> - This PR is generally safe to merge, but has a couple of doc-quality issues that should be cleaned up. - Only documentation changed; the main concerns are a visible typo and slightly broken/fragile markdown formatting in the permissions section that can render poorly on the docs site. - docs/channels/feishu.md <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->