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>

src/lib/redis.ts

@@ -0,0 +1,33 @@
+import Redis from "ioredis";
+
+let redis: Redis | null = null;
+
+export function getRedis(): Redis | null {
+  const url = process.env.REDIS_URL;
+  if (!url) return null;
+  if (!redis) {
+    redis = new Redis(url, { maxRetriesPerRequest: 3, lazyConnect: true });
+  }
+  return redis;
+}
+
+export async function cacheGet<T>(key: string): Promise<T | null> {
+  const r = getRedis();
+  if (!r) return null;
+  try {
+    const val = await r.get(key);
+    return val ? (JSON.parse(val) as T) : null;
+  } catch {
+    return null;
+  }
+}
+
+export async function cacheSet(key: string, value: unknown, ttlSec = 3600) {
+  const r = getRedis();
+  if (!r) return;
+  try {
+    await r.setex(key, ttlSec, JSON.stringify(value));
+  } catch {
+    /* ignore */
+  }
+}