feat: Add cache clear api route

lib/handshake.js

@@ -328,6 +328,19 @@ function extractCidFromRecords(records) {
   return null;
 }
 
+
+/**
+ * Clear the cache for a specific domain
+ * @param {string} domain - The Handshake domain to clear from cache
+ */
+function clearCache(domain) {
+  if (CACHE_ENABLED) {
+    cache.del(`hns:${domain}`);
+    console.log(`Cache cleared for ${domain}`);
+  }
+}
+
 module.exports = {
-  resolveHandshake
+  resolveHandshake,
+  clearCache
 };