Fix MCP names and profile API format consistency ...

- Replace stale mcp__navi_web__* / mcp__navi_3d__* names with canonical
  mcp__navi-web__* / mcp__navi-3d__* across prompts and key_tools.
- Update /agents/profiles and /admin/profiles endpoints to expose
  tools.agent / tools.subagent instead of deprecated enabled_tools fields.
- Update docs/mechanics.md to reference the new tools structure.
- Archive stale docs/visual.html.

Co-Authored-By: Claude <noreply@anthropic.com>