fix(object-list): keep searching across all pages until exhausted

[ajax-bakun-n]

Description

Object search only filtered the already-loaded page (up to 1000 objects) instead of continuing through the rest of the bucket, so a match further in was reported as not found.

This adds an automatic, debounced background pagination loop that keeps fetching subsequent pages while a search term is active, until the prefix is exhausted — with a stop/resume control so the user can cut a long scan short.

Type of Change

• New feature (auto-continue search + stop/resume control)

Testing

• Unit tests added/updated
• Manual testing completed (verified against a live rustfs deployment)

pnpm test:run

Checklist

• Code follows the project's style guidelines
• Self-review completed
• TypeScript types are properly defined
• All commit messages are in English (Conventional Commits)
• All existing tests pass
• No new dependencies added

Related Issues

Closes rustfs/rustfs#2093

Additional Notes