feat(tools): add IPInfo tool — IP geolocation and network intelligence

[nikhilvarmakandula]

Closes #6508

Summary

Adds IPInfo integration using ipinfo.io — free tier, 50k requests/month.

Tools Added

• ipinfo_get_ip_details(ip) — location, org, timezone for any IP
• ipinfo_get_my_ip() — details for current machine's IP

Credential

• IPINFO_TOKEN (free signup at ipinfo.io)

Testing

• ipinfo_get_ip_details("8.8.8.8") → Google DNS location ✅
• ipinfo_get_my_ip() → current machine location ✅

Notes

• Follows existing credential pattern (brevo_tool)
• Parent issue: [Integration]: Expand agent capabilities by adding more integrations/tools #2805

[github-actions]

PR Requirements Warning

This PR does not meet the contribution requirements.
If the issue is not fixed within ~24 hours, it may be automatically closed.

PR Author: @nikhilvarmakandula
Found issues: #5997 (assignees: none), #2805 (assignees: none)
Problem: The PR author must be assigned to the linked issue.

To fix:

1. Assign yourself (@nikhilvarmakandula) to one of the linked issues
2. Re-open this PR

Exception: To bypass this requirement, you can:

• Add the micro-fix label or include micro-fix in your PR title for trivial fixes
• Add the documentation label or include doc/docs in your PR title for documentation changes

Micro-fix requirements (must meet ALL):

Qualifies	Disqualifies
< 20 lines changed	Any functional bug fix
Typos & Documentation & Linting	Refactoring for "clean code"
No logic/API/DB changes	New features (even tiny ones)

Why is this required? See #472 for details.