Use Kimi K2.6 for free and lite (#561) #6296

Job	Run time
build-and-check	2m 55s
test-integration-packages/billing	59s
test-integration-common	44s
test-integration-packages/agent-runtime	39s
test-integration-web	44s
test-.agents	45s
test-integration-packages/internal	1m 10s
test-cli	59s
test-packages/billing	45s
test-packages/agent-runtime	51s
test-sdk	41s
test-common	51s
test-packages/internal	48s
test-integration-sdk	1m 20s
test-web	59s
test-integration-cli	46s
	15m 56s

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