Simplify data management settings

[initstring]

Summary

• replace the database settings route with a streamlined data management page focused on exporting, importing, and clearing operations and taxonomy
• collapse the database router into a new data router that only handles taxonomy and operation backups/restores and remove user/group handling
• update navigation, documentation, and tests to reflect the new data-focused functionality

Testing

• npm run check
• npm run test

---

https://chatgpt.com/codex/tasks/task_e_68cf23e18cc483239eddb299953ce13d

[initstring]

@codex this PR has been revised to simplify data management tab - keeping it focused on unique user data (operations and taxonomy) and offering a simple clear/backup/load.

Please do a final review.

[chatgpt-codex-connector]

Codex Review: Here are some suggestions.

Reply with @codex fix comments to fix any unresolved comments.

About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you open a pull request for review, mark a draft as ready, or comment "@codex review". If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex fix this CI failure" or "@codex address that feedback".