Add local seo MCP tools + UX improvements.

## What's new

- Add MCP tools for local SEO:
  - Search nearby businesses.
  - Fetch Google Maps and Local Finder results.
  - Read Google Business Profile Q&A.

## Improved

- Sort domain keywords and rank-tracking suggestions by traffic by default.
- Clarify keyword metric tooltips across keyword tables.
- Improve MCP registration for Perplexity and other dynamic clients.

Full Changelog: https://github.com/every-app/open-seo/compare/v0.0.15...v0.0.16
