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>

docker-compose.yml

@@ -0,0 +1,49 @@
+services:
+  web:
+    build: .
+    ports:
+      - "${PORT:-3000}:3000"
+    environment:
+      NODE_ENV: production
+      DATABASE_URL: postgresql://scanner:scanner@postgres:5432/domain_scanner?schema=public
+      REDIS_URL: redis://redis:6379
+      NEXTAUTH_URL: ${NEXTAUTH_URL:-http://localhost:3000}
+      NEXTAUTH_SECRET: ${NEXTAUTH_SECRET:-change-me-in-production}
+      NEXT_PUBLIC_APP_URL: ${NEXT_PUBLIC_APP_URL:-http://localhost:3000}
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    restart: unless-stopped
+
+  postgres:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: scanner
+      POSTGRES_PASSWORD: scanner
+      POSTGRES_DB: domain_scanner
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U scanner -d domain_scanner"]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+    restart: unless-stopped
+
+  redis:
+    image: redis:7-alpine
+    command: redis-server --appendonly yes
+    volumes:
+      - redis_data:/data
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 5s
+      timeout: 3s
+      retries: 5
+    restart: unless-stopped
+
+volumes:
+  postgres_data:
+  redis_data: