feat: Complete Watchlist monitoring, Portfolio tracking & Listings marketplace
## Watchlist & Monitoring
- ✅ Automatic domain monitoring based on subscription tier
- ✅ Email alerts when domains become available
- ✅ Health checks (DNS/HTTP/SSL) with caching
- ✅ Expiry warnings for domains <30 days
- ✅ Weekly digest emails
- ✅ Instant alert toggle (optimistic UI updates)
- ✅ Redesigned health check overlays with full details
- 🔒 'Not public' display for .ch/.de domains without public expiry
## Portfolio Management (NEW)
- ✅ Track owned domains with purchase price & date
- ✅ ROI calculation (unrealized & realized)
- ✅ Domain valuation with auto-refresh
- ✅ Renewal date tracking
- ✅ Sale recording with profit calculation
- ✅ List domains for sale directly from portfolio
- ✅ Full portfolio summary dashboard
## Listings / For Sale
- ✅ Renamed from 'Portfolio' to 'For Sale'
- ✅ Fixed listing limits: Scout=0, Trader=5, Tycoon=50
- ✅ Featured badge for Tycoon listings
- ✅ Inquiries modal for sellers
- ✅ Email notifications when buyer inquires
- ✅ Inquiries column in listings table
## Scrapers & Data
- ✅ Added 4 new registrar scrapers (Namecheap, Cloudflare, GoDaddy, Dynadot)
- ✅ Increased scraping frequency to 2x daily (03:00 & 15:00 UTC)
- ✅ Real historical data from database
- ✅ Fixed RDAP/WHOIS for .ch/.de domains
- ✅ Enhanced SSL certificate parsing
## Scheduler Jobs
- ✅ Tiered domain checks (Scout=daily, Trader=hourly, Tycoon=10min)
- ✅ Daily health checks (06:00 UTC)
- ✅ Weekly expiry warnings (Mon 08:00 UTC)
- ✅ Weekly digest emails (Sun 10:00 UTC)
- ✅ Auction cleanup every 15 minutes
## UI/UX Improvements
- ✅ Removed 'Back' buttons from Intel pages
- ✅ Redesigned Radar page to match Market/Intel design
- ✅ Less prominent check frequency footer
- ✅ Consistent StatCard components across all pages
- ✅ Ambient background glows
- ✅ Better error handling
## Documentation
- ✅ Updated README with monitoring section
- ✅ Added env.example with all required variables
- ✅ Updated Memory Bank (activeContext.md)
- ✅ SMTP configuration requirements documented
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