feat: downgrade node version to 18 #146

Job	Run time
Prepare verification matrix	8s
Package compatibility / Node 22	24s
Package compatibility / Node 24	22s
Package compatibility / Node 18 (sdk-only)	17s
Package compatibility / Node 20 (sdk-only)	28s
Verify / test	23s
Verify / architecture	13s
Verify / lint-changed	7s
Verify / audit	9s
Verify / lint	11s
Verify / typecheck	40s
Verify / build-webui	7s
Gate	4s
	3m 33s

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