test: add unit tests for rate limiter middleware

src/server/middleware/rateLimit.ts

@@ -46,3 +46,8 @@ export async function rateLimit(c: Context, next: Next) {
 	entry.count++;
 	return next();
 }
+
+/** @internal — only for testing */
+export function _resetForTesting() {
+	store.clear();
+}