Default freebuff to DeepSeek V4 Pro, switch lite to Kimi #6351

Job	Run time
build-and-check	2m 42s
test-integration-packages/billing	1m 14s
test-integration-packages/internal	1m 13s
test-integration-cli	54s
test-integration-packages/agent-runtime	51s
test-integration-web	50s
test-integration-sdk	1m 17s
test-integration-common	43s
test-packages/agent-runtime	51s
test-common	51s
test-cli	51s
test-packages/internal	44s
test-packages/billing	37s
test-sdk	44s
test-.agents	58s
test-web	2m 21s
	17m 41s

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