feat(smartacme): Implement exponential backoff retry logic and graceful shutdown handling in SmartAcme; update acme-client dependency to v5.4.0

package.json

@@ -51,7 +51,7 @@
     "@push.rocks/smarttime": "^4.1.1",
     "@push.rocks/smartunique": "^3.0.9",
     "@tsclass/tsclass": "^9.0.0",
-    "acme-client": "^4.2.5"
+    "acme-client": "^5.4.0"
   },
   "devDependencies": {
     "@apiclient.xyz/cloudflare": "^6.3.2",