feat: Add Health Monitoring to Portfolio page
PORTFOLIO HEALTH MONITORING:
- Added 'Health' column to portfolio table
- Health check button with SSL, DNS, HTTP analysis
- Full Health Report Modal with:
- DNS Infrastructure (NS, A, MX records)
- Website Status (reachable, HTTP status)
- SSL Certificate (valid, expiry days)
- Signals & Recommendations
- Uses quickHealthCheck API for any domain
- Status badges: Healthy, Weak, Parked, Critical
FEATURE STATUS CHECK:
✅ My Listings (/command/listings):
- Create listings with domain verification
- DNS-based verification
- Public listing pages
- Inquiry management
✅ Sniper Alerts (/command/alerts):
- Custom filters (TLD, length, price, keywords)
- No numbers/hyphens options
- Email notification toggle
- Test alert functionality
- Match history
✅ SEO Juice (/command/seo):
- Domain SEO analysis
- Domain Authority, Backlinks
- Notable links (Wikipedia, Gov, Edu)
- Top backlinks list
- Tycoon-only feature
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