NocoBase v2.0.38: Improve AI employees' ability to parse uploaded documents

[AI employees] Improve AI employees’ ability to parse uploaded documents (#9126) by @cgyrock

[logger] Add referer information to request logs (#9110) by @2013xile
[undefined] Sync translated environment-variable and cluster-mode docs with the latest Chinese updates. (#9115) by @mytharcher
[AI employees] After AI employee block selection, fill form attachment into upload area (#9127) by @cgyrock
[Workflow: Manual node] Use simplePagination on workflow tasks related collections for better list performance (#9117) by @mytharcher
[Workflow: Approval] Use simplePagination on approvals and approvalRecords collection for better list performance by @mytharcher

[client]
- Fixed the optional options of single-select fields in field rule configuration are empty (#9119) by @jiannx
- Fixed incorrect default value settings for sub table in form. (#9087) by @gchust
[Notification: In-app message] Fix the issue where receiver select component works not correctly (#9123) by @mytharcher
[AI employees] Fix the issue where the baseURL settings of google-gen-ai’s LLM service does not take effect (#9107) by @cgyrock
[Email manager] Remove form closing prompt after email is sent successfully by @jiannx