support config filename in meta for create_blob_message

[StoneFancyX]

Summary

Fixes #15322

• If the meta has a "file_name" key:
  • If an extension is set, the system does nothing.
  • If no extension is set, it automatically adds an extension.
• If the meta lacks a "file_name" key, the system uses the original naming method.

Screenshots

when the meta has a "file_name" key

before

after

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: zh_CN tool.md,jp tool.md,en tool.md
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods