feat: rebrand to Domain Scanner platform

Replace GeoExport static site with Next.js domain intelligence app:
real DNS/WHOIS/SSL/HTTP/geo scans, SSE progress, Docker stack,
updated install/uninstall scripts, and full documentation.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/MARKETING.md

@@ -0,0 +1,32 @@
+# Marketing
+
+## GitHub About
+
+Modern domain intelligence and infrastructure analysis platform with premium UX, real-time monitoring, and scalable self-hosted architecture.
+
+## Tagline
+
+See every layer of your domain.
+
+## Product Hunt (draft)
+
+**Title:** Domain Scanner — self-hosted domain intelligence  
+**Subtitle:** DNS, WHOIS, SSL, security headers, and exports in one premium dashboard.
+
+**First comment outline:** Built for SREs and indie hackers who want SecurityTrails-grade signals without SaaS lock-in. Docker + Postgres + real scans via Node.
+
+## Twitter / X
+
+Shipped Domain Scanner — open-source domain intel with cinematic UI, live SSE scans, JSON/CSV export. Self-host on your VPS in one command.
+
+## Dev.to outline
+
+1. Why unified domain scans beat tab-hopping  
+2. Architecture: Next.js + Prisma + Redis  
+3. Implementing SSL checks with Node tls  
+4. SSE for scan progress  
+5. One-line VPS deploy
+
+## SEO keywords
+
+domain scanner, dns lookup tool, ssl checker, whois api, self-hosted security tools