feat: set horizon-alpha model max tokens to 32k for OpenRouter #12948

Job	Run time
knip	42s
check-openrouter-api-key	3s
compile	1m 54s
platform-unit-test (ubuntu-latest)	3m 34s
platform-unit-test (windows-latest)	6m 5s
check-translations	41s
integration-test	6m 56s
notify-slack-on-failure	0s
	19m 55s

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