fix: guard Redis disconnect and increase AfterAll timeout

Redis client may not be connected when rate limits are disabled in tests,
causing disconnect() to throw ClientClosedError. Guard with isOpen check.
Also raise AfterAll timeout to 30s to allow server and DB to shut down.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: github-manager

test/integration/features/shared.ts

@@ -57,11 +57,11 @@ BeforeAll({ timeout: 1000 }, async function () {
   worker.run()
 })
 
-AfterAll(async function() {
+AfterAll({ timeout: 30000 }, async function() {
   await new Promise<void>((resolve) => {
     worker.close(async () => {
       await Promise.all([
-        cacheClient.disconnect(),
+        cacheClient.isOpen ? cacheClient.disconnect() : Promise.resolve(),
         dbClient.destroy(),
         rrDbClient.destroy(),
       ])