Revert "Use Kimi K2.6 for free and lite (#561)" #6302

Job	Run time
build-and-check	3m 7s
test-integration-packages/internal	1m 1s
test-integration-sdk	1m 22s
test-integration-web	46s
test-integration-packages/agent-runtime	44s
test-integration-packages/billing	1m 17s
test-integration-cli	51s
test-cli	1m 19s
test-integration-common	41s
test-common	39s
test-packages/billing	43s
test-packages/internal	46s
test-packages/agent-runtime	47s
test-.agents	51s
test-web	57s
test-sdk	41s
	16m 32s

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