feat(radar): add BGP IP space timeseries and real-time routes tools

[andre-j3sus]

Summary

This PR adds two new BGP tools to the Radar MCP server that address gaps in IPv6 address space monitoring and real-time route visibility:

• get_bgp_ip_space_timeseries: Retrieves announced IP address space over time (IPv4 /24s and IPv6 /48s)
• get_bgp_routes_realtime: Gets real-time BGP routes for a prefix using RouteViews and RIPE RIS collectors

Motivation

The existing BGP tools (get_bgp_route_stats, get_bgp_hijacks, etc.) provide point-in-time statistics and event detection, but were missing:

1. Real-time IPv6 address space monitoring - Ability to track announced IPv6 /48s over time by country or ASN
2. Proactive BGP route withdrawal detection - See address space changes that indicate route withdrawals before they trigger anomaly detection
3. Real-time route visibility - Check current routing state for a prefix across public route collectors

Changes

New Tools

Tool	Endpoint	Description
get_bgp_ip_space_timeseries	/bgp/ips/timeseries	Time series of announced IPv4 /24s and IPv6 /48s. Filter by ASN, location, IP version
get_bgp_routes_realtime	/bgp/routes/realtime	Real-time BGP routes showing AS paths, RPKI validation, peer visibility

New Parameters

• BgpIpVersionParam: Filter by IPv4 or IPv6 for IP space timeseries

Documentation

• Added both tools to the README tools table
• Added example prompts for IPv6 monitoring use cases

[devandrepascoa]

lgtm