Add vmk_data MCP server and realtor profile for real estate search ...

- mcp_servers.d/vmk_data.json: streamable_http to localhost:8080

- navi/profiles/realtor/: config + system_prompt + subagent_system_prompt

Profile includes semantic & FTS search, listing details, schema tools

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